助動詞のmust - 英文法を覚えよう
助動詞のmustとは何か？
まず、助動詞とは、動詞の前について、その動詞の意味を補完する役割を持つ語のことです。助動詞は、時制や否定、疑問などの文の意味を表す役割を担います。英語においてよく使われる助動詞には、"be" や "have"、"do" などがありますが、その中でも"must" は、強い義務や必然性、推量を表す助動詞として知られています。
"must" は、強い義務や必然性、推量を表す助動詞です。肯定文では「〜しなければならない」「〜しなくてはいけない」という意味になります。また、否定文では「〜してはいけない」「〜してはだめ」という意味になり、疑問文では「〜しなければならないのか？」という意味合いになります。
基本的に、「must」は強い義務を表す助動詞として使われますが、時には推量の意味合いを持つこともあります。
助動詞のmustの肯定文
"must" の肯定文は、以下のように使われます。
「must」は、強い義務や必然性を表現する際に使われます。例えば、試験のために勉強しなければならない時や、特定の期限を守らなければならない時などに用いられます。
以下は、肯定文で使われる例文です：
- You must study hard for your exams. (試験のために一生懸命勉強しなければなりません。)
- I must finish this report by tomorrow. (私は明日までにこのレポートを終わらせなければなりません。)
「must」は、直接的な命令や強い義務を表現する際に使われます。また、"have to" や "need to" という表現と似ていますが、"must" はより強い義務感を伴う場合が多いです。
例えば、"You must study" は、「勉強しなければならない」という意味で、"You have to study" や "You need to study" よりも強調された義務感を伝えます。
助動詞のmustの否定文
"must" の否定文は、"must not" または "mustn't" として使われます。
「must not」は、明確な禁止事項や許可されていないことを表すときに使われます。たとえば、何かをしてはいけないときや、強い禁止を表現するときに使用されます。
以下は、否定文で使われる例文です：
- You must not be late for the meeting. (会議に遅れてはいけません。)
- I must not forget to buy milk on my way home. (帰りに牛乳を買うことを忘れてはいけません。)
「must not」は、強い禁止を表現するため、非常に直接的な言い回しです。そのため、日常会話やビジネスシーンでは、少し厳しく聞こえることがあります。そのため、"must not" を使う場面では、状況に応じてもう少し柔らかい表現を使うことが推奨されることもあります。
また、"can't" や "shouldn't" といった他の否定表現と似た意味を持ちますが、「must not」はより強い禁止を意味します。
助動詞のmustの疑問文
"must" の疑問文は、相手に対して強い義務や必要性を尋ねるときに使われます。疑問文では、"must" を文の先頭に置き、疑問の形にします。
疑問文では、「〜しなければならないのか？」という意味合いになります。この形は、相手に対して確認したり、強い義務を求めたりする際に使われます。
以下は、疑問文で使われる例文です：
- Must I submit this report by today? (私は今日中にこのレポートを提出しなければならないのでしょうか？)
- Must we turn off the lights before leaving the office? (私たちはオフィスを出る前に電気を消さなければなりませんか？)
「must」の疑問文は、相手に対して直接的な命令や義務を尋ねるときに使われますが、"have to" や "need to" と似た意味を持つ場合もあります。
疑問文では、否定的な意味を含める場合、"must not" を使うこともあります。例えば、「Must I not do this?」は、「これをしてはいけないのか？」という意味になります。
また、"must" の疑問文には、肯定文と同じく、外部からの強い義務や必要性に関する確認を求める場合にも使われます。
mustをhave toに置き換える
"must" は、同じように義務や必要性を表す表現として、"have to" に置き換えることができます。両者の意味は非常に似ており、状況に応じて使い分けられますが、微妙なニュアンスの違いがあります。
例えば、以下の2つの文はほぼ同じ意味ですが、"must" はより強い義務感を表現することが多く、"have to" は外部からの義務を表す場合に使われることが多いです。
- I must finish this report by tomorrow. (私は明日までにこのレポートを終わらせなければなりません。)
- I have to finish this report by tomorrow. (私は明日までにこのレポートを終わらせなければなりません。)
上記の文の意味はほとんど同じですが、"must" は、より強い義務感を伴う場合に使われることが多いです。一方、"have to" は、外部の状況や他の人から強い義務が課せられた場合に使われることが多いです。
"have to" は、否定形や疑問形が次のように変化します：
- Negative: "I don't have to" (〜しなくてよい)、"You don't have to" (〜しなくてよい)
- Question: "Do I have to?" (〜しなければならないのですか？)
一方で、"must" を使う場合、否定形は "must not"、疑問形はそのまま "must" を使って疑問文にします。
このように、「must」と「have to」は、基本的に置き換え可能ですが、ニュアンスの違いに注意する必要があります。"must" は強い義務や内面的な決定に基づく義務を表すことが多く、"have to" は外部からの義務や状況に基づく義務を表すことが多いです。
| フォニックス |
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| フォニックス発音練習【1】 短母音（A、E、I、O、U）、子音（B,K,D,F,G,H,J,L,M,N,P,Qu,R,S,T,V,W,X,Y,Z,softC,hardC,softG,hardG） |
| フォニックス発音練習【2】母音ペア（AI、AY、EI、IE、EA、EE、OA、OW、UE,UI、OI、OY、OU、OO、AU、AW）、Rが付いた母音（AR、ER、IR、UR、OR、ORE、EAR、AIR、ARE）、子音ダイヤグラフ（CH、SH、TH、CK、WH、GH、PH）、サイレントE |
| フォニックス発音練習【3】 子音ブレンド（BL,CL,FL,GL,PL,BR,CR,DR,FR,GR,PR,TR,SC,SK,SM,SN,SP,ST,SW,SQU,SCR,SPL,SPR,STR,THR） |
| 中学英単語 |
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| 人称代名詞【1】 I, my, me, mine, you, your, you, yours, he, his, him, his, she, her, her, hers, it, its, it, we, our, us, ours, they, their, them, theirs |
| 代名詞【2】 this, these, that, those, myself, yourself, himself, herself, ourselves, everybody, somebody, nobody, everyone, someone, anyone, none, everything, something, anything, nothing, each, other, another, all, both |
| be動詞・助動詞・疑問詞【3】 be, am, are, is, was, were, do, dose, did, can, cannot, could, will, would, may, might, must, shall, should, have to, who, whose, whom, what, which, when, where, why, how, how many, how much, how old |
| 冠詞・間投詞・接続詞・省略形【4】 be, am, are, is, was, were, do, dose, did, can, cannot, could, will, would, may, might, must, shall, should, have to, who, whose, whom, what, which, when, where, why, how, how many, how much, how old |
| 前置詞【5】 about, above, across, after, against, along, around, as, at, before, behind, below, beside, between, among, by, down, during, except, for, from, in, to, into, of, on, onto, minus, near, outside, over, since, than, through, toward, under, until, up, upon, with, without |
| 名詞（数）【6】 zero, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety, hundred, thousand, million |
| 名詞（曜日・月・Ac-Af）【7】 Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, January, February, March, April, May, June, July, August, September, October, November, December, accident, acid rain, action, active volcano, activity, actor, actress, address, adult, advantage, adventure, advice, affection, Africa, afternoon |
| 名詞（Ag-Ba）【8】 age, air, air conditioner, air pollution, airport, album, ambulance, America, American, amusement park, ancestor, anchor, animal, animation, ant, apple, architect, area, arm, art, artist, arts and crafts, Asia, assistance, astronaut, athlete, atomic bomb, attack, attention, aunt, Australia, autumn, baby, back |
| 名詞（Ba-Bo）【9】 backyard, badge, bag, ball, balloon, ballpark, bank, barrier, baseball, basketball, bath, bathroom, bazaar, beach, bear, beauty, bed, beginner, beginning, Beijing, belief, bicycle, bike, biotechnology, bird, birthday, blanket, blood, blossom, board, boat, body, bomb |
| 名詞（Bo-Ca）【10】 book, border, bottle, bottom, box, boy, boycott, braille, branch, Brazil, bread, breakfast, breath, breeze, bridge, British, broadcasting, brother, brotherhood, buffet, building, burger, bus, business, button, cafeteria, cage, cake, calligraphy, camera, campaign, Canada, cancer |
| 名詞（Ca-Ch）【11】 candy, cap, capital, captain, car, card, care, carpenter, carrot, carton, cartoon, case, cat, cattle, cause, cave, CD, ceiling, cell, cent, center, centimeter, century, cereal, chain, chair, championship, chance, character, charity, chart, chemical, cherry |
| 名詞（Ch-Co）【12】 chicken, child, children, China, Chinese, chopsticks, chorus, Christmas, church, city, class, classmate, classroom, clerk, clock, cloth, clothes, cloud, club, coffee, collection, college, color, comic, communication, company, computer, concert, conclusion, condominium, conductor, conference, connection |
| 名詞（Co-De）【13】 convenience, conversation, cook, cooperation, corner, costume, country, countryside, couple, courage, course, cousin, cow, crane, creativity, creature, crop, cuisine, culture, cup, curry, curtain, custom, cut, dance, dancer, danger, date, daughter, day, deadline, death, decision |
| 名詞（De-Do）【14】 deer, degree, democracy, demonstration, dentist, desert, desk, despair, detective, developing country, diary, dictionary, difference, difficulty, dignity, dinner, dinosaur, director, disaster, discussion, disease, display, distance, diver, doctor, dog, doll, dollar, dolphin, dome, door, doorbell, dot |
| 名詞（Dr-Ev）【15】 drama, dream, dress, driver, drum, e-mail, e-pal, ear, earth, earthquake, east, echo, egg, Egypt, electricity, elephant, emergency, end, endangered animals, energy, engine, engineer, England, entrance, envelope, environment, episode, equality, era, eraser, Europe, evacuation, evening |
| 名詞（Ex-Fi）【16】 examination, example, exchange, exhibition, exit, experience, expression, eye, eyesight, face, facility, fact, factory, fall, family, farewell, farm, farmer, fate, father, fault, favor, feeling, feet, fellow, fence, festival, fever, fiction, field, fine arts, finger, fire, firework |
| 名詞（Fi-Ge）【17】 fish, fitting room, flag, flame, flight, floor, flower, flute, folk, food, football, foreigner, forest, fossil fuel, fountain, fox, frame, France, French fries, fridge, friend, friendship, frog, front, fruit, fun, future, game, garbage, garden, gas, gate, gentleman |
| 名詞（Ge-Ha）【18】 German, Germany, gesture, gift, girl, glass, global warming, goal, God, gold, goodness, goose, gorilla, government, grade, grandchild, grandfather, grandmother, grass, grassland, green, greenhouse gases, greeting, ground, group, guest, guide, guitar, gull, habit, habitat, hair, Halloween |
| 名詞（Ha-Ho）【19】 hamburger, hand, handkerchief, handle, harm, harvest, hat, hay fever, head, headache, health, heart, heat, heritage, hero, highland, hill, hint, history, hobby, hole, holiday, home, home economics, homepage, homestay, homework, honey, honor, horizon, horse, hospital, host |
| 名詞（Ho-Ju）【20】 hotel, hour, house, humor, hunger, husband, idea, impact, importance, impossible, impression, India, Indian, influence, information, ink, insect, inspiration, instrument, interest, internet, interview, island, jam, Japan, Japanese, jellyfish, job, journey, joy, juice, jungle, justice |
| 名詞（Ke-Li）【21】 key, kilometer, kind, kindness, king, kingdom, kitchen, kite, knee, knife, knowledge, koala, Korea, lady, lake, land, landmine, language, lavatory, law, lawyer, leader, leaf, leaves, left, leg, lesson, letter, library, life, lives, light, line |
| 名詞（Li-Me）【22】 lion, liquid, locker, London, loss, lot, lullaby, lunch, machine, magic, man, men, manner, mansion, map, market, mask, master, match, mathematics, math, matter, meal, meaning, measure, meat, medal, medicine, meeting, member, memorial, memory |
| 名詞（Me-Mt）【23】 mess, message, meter, Mexico, midnight, mile, milk, minister, minute, mirror, Miss, mistake, model, mom, moment, money, monkey, monster, monument, moon, moral education, morning, mother, motto, mountain, mouse, mouth, movement, movie, Mr., Mrs., Ms., Mt. |
| 名詞（Mu-Nu）【24】 museum, music, musical, musician, nail, name, nap, nation, nature, neck, needle, neighbor, neighborhood, nephew, nest, net, New York, New Zealand, news, newspaper, nickname, niece, night, Nobel Peace Prize, noise, noon, north, northeast, nose, notebook, notice, number, nun |
| 名詞（Nu-Pa）【25】 nurse, obstacle, occupation, ocean, octopus, office, officer, oil, opera, operator, opinion, orange, orchestra, order, organ, outside, oxygen, ozone, page, pain, paint, painter, painting, pair, paper, pardon, parent, park, parking, part, partner, party, passport |
| 名詞（Pe-Pl）【26】 PE, peace, peel, pen, pencil, people, period, permission, person, pet, pharmacist, phone, photo, photographer, phrase, piano, picnic, picture, piece, pig, pillar, pilot, pink, pity, place, plan, plane, planet, plant, plastic, plate, player, playground |
| 名詞（Pl-Qu）【27】 pleasure, pocket, poem, poet, point, poison, police, pollution, pool, population, post, poster, pot, potato, power, present, presentation, pressure, price, priest, principal, priority, problem, program, project, promise, pumpkin, purple, purpose, pyramid, queen, question, quiz |
| 名詞（Ra-Ri）【28】 rabbit, race, racket, radio, rain, rainbow, rainforest, ramp, rat, ray, reason, recess, recipe, rectangle, recycling, refugee, relationship, relay, report, reporter, reproach, research, resource, rest, restaurant, restroom, rhythm, rice, rice cake, rider, right, ring, risk |
| 名詞（Ri-Sh）【29】 river, road, rock, rocket, roof, room, rose, rule, ruler, sadness, safety, sale, salesclerk, salmon, salt, sanctuary, sand, scene, school, science, scientist, scissors, sculpture, sea, season, seat, secondhand store, secret, section, seed, sentence, service, shade |
| 名詞（Sh-So）【30】 shape, sheep, sheet, shelf, ship, shirt, shoes, shop, shopping, shot, shoulder, shrine, side, sightseeing, sign, silver, singer, sister, site, situation, size, skill, skin, sky, slave, slum, smoke, snow, soccer, socks, social studies, softball, soldier |
| 名詞（So-St）【31】 solution, son, song, sound, soup, south, souvenir, space, spaceship, Spain, speaker, specialist, speech, spoon, sport, spring, square, stadium, stairs, stamp, stapler, star, starvation, station, statue, stay, step, stick, stomach, stomachache, stone, store, storm |
| 名詞（St-Te）【32】 story, stranger, street, string, struggle, student, style, subject, suburb, subway, success, summer, sun, sunrise, sunset, surface, survey, sweater, sword, symbol, system, T-shirt, table, tag, tail, task, tea, teacher, teacup, team, tear, telephone, telescope |
| 名詞（Te-To）【33】 television, temper, temperature, temple, tennis, test, textbook, Thanksgiving Day, theater, theme, thief, thing, thought, ticket, tiger, time, tissue, toast, today, toe, toilet, tomato, tomorrow, ton, tongue, tonight, tooth, teeth, toothache, top, tower, town, toy |
| 名詞（Tr-Un）【34】 track, track and field, trade, tradition, traffic, tragedy, train, trap, trash, travel, tray, treasure, tree, triangle, trick, trip, trouble, truck, trust, truth, tube, turkey, turn, turtle, TV, U.K., umbrella, United Nations, uncle, unicycle, uniform, United States, unity |
| 名詞（Un-We）【35】 universal design, university, use, vacation, value, variety, vegetable, vending machine, vet, victim, video, video game, view, village, violin, visit, visitor, voice, volcano, volleyball, volume, volunteer, vulture, waitress, wall, wallet, war, water, waterfall, way, weapon, weather, weather forecast |
| 名詞（We-Zo）【36】 web, week, weekend, well, west, whale, wheel, wheelchair, wife, wind, windmill, window, wine, wing, winner, winter, wish, witch, wolf, woman, wood, word, work, worker, world, World Heritage Site, yacht, year, yellow, yen, yesterday, zebra, zoo |
| 形容詞（順序を表す言葉）【37】 first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, thirtieth, fortieth, fiftieth, sixtieth, seventieth, eightieth, ninetieth, hundredth, thousandth, millionth |
| 形容詞（Ab-Ce）【38】 able, active, adult, afraid, all, American, ancient, angry, another, any, artificial, asleep, atomic, awesome, bad, ill, worse, worst, bare, basic, beautiful, big, black, blind, blue, bored, boring, born, both, breathtaking, bright, British, brown, busy, careful, centigrade, certain |
| 形容詞（Ch-Dr）【39】 cheap, cheerful, chemical, Chinese, civil, clean, clever, close, cloudy, cold, colorful, comfortable, commercial, common, compulsory, conceited, confused, convenient, cool, correct, creative, crowded, cute, daily, dangerous, dark, dead, deaf, dear, deep, delicious, depressed, different, difficult, dirty, disabled, disappointed, dry |
| 形容詞（Dy-Fr）【40】 dying, each, easy, economic, efficient, elderly, elegant, elementary, else, embarrassed, empty, equal, even, every, exact, excited, exciting, expensive, fair, faithful, famous, far, fast, favorite, few, fine, fit, fond, foolish, foreign, former, foster, free, fresh, friendly, frightened, frustrated |
| 形容詞（Fu-La）【41】 full, funny, German, glad, global, good, well, better, best, great, greedy, half, happy, hard, healthy, heavy, high, honest, hot, huge, human, hungry, important, impossible, Indian, industrial, injured, integrated, intense, interested, interesting, international, itchy, Japanese, junior, kind, large |
| 形容詞（La-No）【42】 last, late, light, little, less, least, living, long, loud, lucky, major, many, much, more, most, master, meaningful, medium, memorial, mighty, military, minor, miserable, modern, musical, narrow, national, natural, naughty, necessary, neither, nervous, new, next, nice, noble |
| 形容詞（No-Re）【43】 noisy, northeast, northern, nuclear, official, old, only, open, opposite, optimistic, ordinary, original, other, outside, own, pale, paralyzed, particular, peaceful, perfect, plastic, pleasant, polite, political, poor, popular, positive, possible, present, pretty, proud, public, quiet, rainy, ready, real, red |
| 形容詞（Re-St）【44】 regular, relaxed, responsible, rich, ridiculous, right, round, sacred, sad, safe, same, scary, selfish, senior, serious, several, short, shy, sick, silent, silly, similar, simple, sleepy, slow, small, smart, smooth, snowy, sociable, soft, some, sore, sorry, sour, special, stiff, straight |
| 形容詞（St-Yo）【45】 strange, strong, stupid, such, sunny, sure, sweet, tall, terrible, thirsty, tired, tourist, traditional, true, unbelievable, unclean, underground, unequal, unhappy, useful, usual, vast, virtual, warm, weak, welcome, western, white, whole, wide, wild, willing, windy, wonderful, worth, wrong, young |
| 動詞（Ac-Br）【46】 act, add, admire, advertise, agree, allow, amaze, answer, appear, arrest, arrive, ask, assist, attack, bark, bear, become, became, begin, began, begun, believe, belong, blame, blow, blew, boil, border, borrow, bother, break, broke, broken |
| 動詞（Br-Co）【47】 bring, brought, broaden, brush, build, built, bump, burn, bury, buy, bought, call, campaign, care, carry, catch, caught, cause, celebrate, change, chew, choose, chose, clean, climb, close, collect, come, came, communicate, compare, complain, contact |
| 動詞（Co-Ea）【48】 continue, control, cook, cost, cough, count, cover, create, cross, cry, decide, decorate, decrease, develop, die, disagree, disappear, discover, displace, display, do, does, did, done, draw, drew, dream, drink, drank, drunk, drive, drop, dump, earn |
| 動詞（Ea-Fu）【49】 eat, ate, eaten, elect, enjoy, enter, excuse, expect, explain, explode, export, fail, fall, fell, fascinate, fasten, feel, felt, fight, fought, fill, find, found, finish, float, fly, flew, fold, follow, forget, forgot, forgive, fulfill |
| 動詞（Ga-Hu）【50】 gather, get, got, give, gave, given, go, went, gone, graduate, grow, grew, guess, guide, handle, hang, happen, harm, hate, have, has, had, heal, hear, heard, help, hide, hit, hold, held, hope, hurry, hurt |
| 動詞（Im-Le）【51】 imagine, increase, injure, inspire, insult, interest, introduce, invent, investigate, invite, join, judge, jump, keep, kill, knit, knock, know, knew, known, land, last, laugh, launch, lay, laid, lead, led, learn, leave, lend, lent |
| 動詞（Li-Pa）【52】 lie, lay, lain, lied, lift, like, listen, live, locate, look, lose, make, made, marry, master, mean, meant, meet, met, mind, miss, move, need, nod, offer, open, order, overcome, paint, park, participate, pass, pay, peel |
| 動詞（Pi-Re）【53】 pick, plan, plant, play, please, poison, pollute, post, practice, prefer, prepare, present, print, produce, protect, provide, publish, pull, punish, push, put, rain, raise, reach, react, read, realize, rebuild, receive, recognize, recycle, reduce, refresh |
| 動詞（Re-So）【54】 reject, relay, release, remain, remember, remind, remove, report, represent, reproach, rescue, research, respect, respond, return, reuse, ride, rode, ridden, rise, run, ran, run, save, say, said, scare, scold, search, see, saw, seen, seem, sell, sold |
| 動詞（Se-St）【55】 send, sent, separate, sew, shake, sheet, shine, shoot, shop, shout, show, shut, sing, sang, sung, sit, sat, ski, sleep, smell, smile, smoke, snow, solve, sort, sound, speak, spoke, spoken, spell, spend, stand, start, starve, stay |
| 動詞（St-Tr）【56】 sting, stop, strive, struggle, study, succeed, suffer, support, suppose, surf, surprise, surround, survive, swallow, swim, swam, swum, take, took, taken, talk, teach, taught, tease, tell, told, thank, think, throw, threw, thrown, touch, travel, treat |
| 動詞（Tr-Ya）【57】 trust, try, turn, uncover, understand, understood, use, visit, wait, wake, woke, woken, walk, want, wash, waste, watch, weaken, wear, weigh, whisper, whistle, win, won, wish, wonder, work, worry, wrap, wrestle, write, wrote, written, yacht |
| 副詞（A.-Fi）【58】 a.m., about, abroad, again, ago, almost, alone, aloud, already, also, always, anytime, anywhere, away, back, best, better, carefully, certainly, cheerfully, clearly, closely, definitely, downstairs, early, easily, either, else, enough, especially, even, ever, everywhere, fast, finally |
| 副詞（Fl-Ra）【59】 fluently, forever, forward, happily, here, incredibly, instead, just, later, long, maybe, more, most, never, no, northeast, not, now, o’clock, off, often, OK, once, out, outside, over, p.m., perhaps, please, precisely, quickly, quietly, quite, rather |
| 副詞（Re-Ye）【60】 ready, really, right, round, sadly, sincerely, slowly, so, someday, somehow, sometimes, soon, still, straight, strongly, suddenly, sure, then, there, tightly, together, tomorrow, tonight, too, truly, unfairly, up, usually, very, well, worst, yes, yesterday, yet |