高中语法之情态动词
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Such things ought not to be done.
V. need(需要)与 dare（敢）
情态动词和实义动词的区别 A. 人称变化 B. do / to do C. 直接否定 / 间接否定 1. need/dare 肯定句中， 实义动词
She needs to do it. She dares to do it.
The fire spread through the hotel very
quickly but everyone _D__ get out.
A. had to B. would
C. could
D. was able to
注意：can 和 be able to的区别
1.can只有两种时态 be able to有多种时态和形式
How can you be so careless? He couldn’t be over sixty.
1. Mr. Bush is on time for everything. How __A__ it be that he was late for the opening ceremony? A. can B. should C. may D. must
There was no more bus. They ___h_a_d__t_o___ walk home.
1.Johnny, you ___B___play with the knife, you ____hurt
yourself.
A. won't ; can't
B. mustn't ; may
-- Need I come? -- Yes, you must. -- No, you needn’t 2. Dare 情态动词时，有过去式 -- dared
I dared not quarrel with him.
1.You ____C____ him about it as I have told h im.
2. 用于否定句，疑问句中，情态动词、实义动词
She need not go there. She doesn’t need to go there. She dare not go there. She doesn’t dare (to) go there.
注意：
1. NeΒιβλιοθήκη Baidud意为“必须”时，只用于否定或疑问句中
2.可表经过一番努力成功地做成某事
II. may 与might
1. 表示“许可”或“请求”，有“可以”的意思，口语中 常用 might 代 may ,表示委婉语气。 否定回答时用“must not”表“禁止，阻止”， 不用 “may not”. “may not” 表示“可能不” 。 --- May I watch TV after supper? --- Yes, you may. / No, you mustn’t.
You should keep your promise.
2. 用于表推测。 意为 “可能、按理应该…”
It’s 7 o’clock, he should be at home. It’s nearly time for class to start. The teacher should be here soon. 3. Ought to 用于表劝告、建议。 意为”应该、应 当”,口气比should 稍微重。
2. may/ might as well + do “…还是…为好”
You may as well go and have a look.
3. May you +动词原形 表“希望、祝愿、祈求” “祝你……”
May you succeed.
III. must与have to
1. 表示义务或强烈的劝告，意为“必须”“应该”， 其否定式表示 “不准”“禁止”。
finish it in three days.
注意：表示“必须”这个意思时，must 和 have to 稍有区别。must着重说明主观看法， have to 强调客观需要。另外，have to 能用 于更多时态。
I don’t like this TV set. We __m__u_s_t_ buy a new one.
could 代替 can 使语气更委婉，回答时用can)
Can/Could I use your dictionary? Could you lend me a hand? 3. 表示“许可”，可与may 换用。
You can go home now.
4. can 用于疑问句或否定句中时，表惊异、怀疑或 不相信等，意思是“可能、能够”。
A. need not to tell B. don’t need tell
C. shouldn't ; must D. can't ; wouldn't
2. I missed the bus, so I __D_ go home on foot. A. must B. may C. can D. had to
IV. should 与 ought to
1. 用于表劝告、建议。 意为”应该、应当”。
情态动词 ( modal verbs)
情态动词表说话人的某种感情 或语气，对某一动作或状态的 某种态度。表示“需要、可以、 必须、应当”等。
I. can 与could
1.表能力或客观可能性 I can speak English. Man can not live without air or water. 2. 表示“请求” “允许”(表请求时，口语中常用
You must finish your homework first. Children mustn’t speak like that to their parents.
2. 回答 must 所在的一般疑问句时，否定回答用 “needn’t” “don’t have to”.
---Must we finish the work tomorrow? ---No, you needn’t/ don’t have to, but you must
V. need(需要)与 dare（敢）
情态动词和实义动词的区别 A. 人称变化 B. do / to do C. 直接否定 / 间接否定 1. need/dare 肯定句中， 实义动词
She needs to do it. She dares to do it.
The fire spread through the hotel very
quickly but everyone _D__ get out.
A. had to B. would
C. could
D. was able to
注意：can 和 be able to的区别
1.can只有两种时态 be able to有多种时态和形式
How can you be so careless? He couldn’t be over sixty.
1. Mr. Bush is on time for everything. How __A__ it be that he was late for the opening ceremony? A. can B. should C. may D. must
There was no more bus. They ___h_a_d__t_o___ walk home.
1.Johnny, you ___B___play with the knife, you ____hurt
yourself.
A. won't ; can't
B. mustn't ; may
-- Need I come? -- Yes, you must. -- No, you needn’t 2. Dare 情态动词时，有过去式 -- dared
I dared not quarrel with him.
1.You ____C____ him about it as I have told h im.
2. 用于否定句，疑问句中，情态动词、实义动词
She need not go there. She doesn’t need to go there. She dare not go there. She doesn’t dare (to) go there.
注意：
1. NeΒιβλιοθήκη Baidud意为“必须”时，只用于否定或疑问句中
2.可表经过一番努力成功地做成某事
II. may 与might
1. 表示“许可”或“请求”，有“可以”的意思，口语中 常用 might 代 may ,表示委婉语气。 否定回答时用“must not”表“禁止，阻止”， 不用 “may not”. “may not” 表示“可能不” 。 --- May I watch TV after supper? --- Yes, you may. / No, you mustn’t.
You should keep your promise.
2. 用于表推测。 意为 “可能、按理应该…”
It’s 7 o’clock, he should be at home. It’s nearly time for class to start. The teacher should be here soon. 3. Ought to 用于表劝告、建议。 意为”应该、应 当”,口气比should 稍微重。
2. may/ might as well + do “…还是…为好”
You may as well go and have a look.
3. May you +动词原形 表“希望、祝愿、祈求” “祝你……”
May you succeed.
III. must与have to
1. 表示义务或强烈的劝告，意为“必须”“应该”， 其否定式表示 “不准”“禁止”。
finish it in three days.
注意：表示“必须”这个意思时，must 和 have to 稍有区别。must着重说明主观看法， have to 强调客观需要。另外，have to 能用 于更多时态。
I don’t like this TV set. We __m__u_s_t_ buy a new one.
could 代替 can 使语气更委婉，回答时用can)
Can/Could I use your dictionary? Could you lend me a hand? 3. 表示“许可”，可与may 换用。
You can go home now.
4. can 用于疑问句或否定句中时，表惊异、怀疑或 不相信等，意思是“可能、能够”。
A. need not to tell B. don’t need tell
C. shouldn't ; must D. can't ; wouldn't
2. I missed the bus, so I __D_ go home on foot. A. must B. may C. can D. had to
IV. should 与 ought to
1. 用于表劝告、建议。 意为”应该、应当”。
情态动词 ( modal verbs)
情态动词表说话人的某种感情 或语气，对某一动作或状态的 某种态度。表示“需要、可以、 必须、应当”等。
I. can 与could
1.表能力或客观可能性 I can speak English. Man can not live without air or water. 2. 表示“请求” “允许”(表请求时，口语中常用
You must finish your homework first. Children mustn’t speak like that to their parents.
2. 回答 must 所在的一般疑问句时，否定回答用 “needn’t” “don’t have to”.
---Must we finish the work tomorrow? ---No, you needn’t/ don’t have to, but you must