③.它们的否定式mustn’t / not have to有很大的不同: mustn’t表示不要(做某事), 有禁止之意; not have to表示不必要(做某事), 含有客观上无此必要之意
a. You mustn’t move a person if he is badly hurt.
b. You don’t have to be a doctor to do first aid.
四.would的用法:
1.表示主观意志和愿望, 即愿意,想要
a. Come here whenever you would.
b. He would not leave before he finished his work.
2.would do sth可以表示过去经常发生的动作, 相当于used to do sth
a. When we were children we would go swimming every summer.
b. On Sundays he would go fishing for hours when he lived in the countryside.
3.表示请求, 愿望, 语气客气, 委婉
a. I would like some tea.
b. Would you mind closing the door ?
c. Would you tell me something about your trip ?
4.表示推测, 表示大概, 也许的意思
a. That would be the pen you are looking for.那也许是你在找的笔吧
五.should的用法:
1.表示义务, 责任, 可译为应当
a. We should complete the text in time.
b. You should be so careless.
2.表示推测或推论, 可译为可能, 应该是
a. He should be home by now, I think.
b. He should have arrived in Nanjing by this time.
3.should / ought to的区别:
should / ought to一般可以通用. should侧重于说话人主观上的看法, 有时含有劝告, 建议的口气, 即 按我的想法应该如何; ought to语气更强, 强调有责任, 有义务做某事或者 按道理应该如何
a. I will start the work at once. I think you should start at once.
b. I will start the work tomorrow. No. You ought to start at once.
六.need的用法: need表示需要, 既可作为情态动词, 也可作实义动词
1.need作实义动词时, 注意以下用法:
①.need to do sth; ②.need sb to do sth; ③.need doing sth (主动形式表被动意义)
a. You need to remain in bed.
b. I need you to help me with the housework.
c. The garden needs watering.( =The garden needs to be watered.)
2.need作情态动词时, 多用于否定句及疑问句中, 不用于肯定句中
a. It is still early. You needn’t hurry. =You don’t need to hurry.
b. It is 11 o’clock. Need I go now? =Do I need to go now ?
3.对于用need的提问, 肯定回答用must, 否定回答用needn’t
a. Need I come? Yes, you must. / No, you needn’t.
七.dare / dared的用法: 表示 敢, 既可作为情态动词, 也可作为实义动词
1.作为情态动词时, 主要用于否定句和疑问句中, 不用于肯定句中
a. Little Jane dared not go alone. =Little Jane didn’t dare to go alone.
b. Dare you go out alone at night ? =Did you dare to go out alone at night ?
2.作为实义动词时, 可用于: dare to do sth
a. Little Jane didn’t dare to go alone.
b. Did you dare to go out alone at night ?
3.should / ought to的区别:
should / ought to一般可以通用. should侧重于说话人主观上的看法, 有时含有劝告, 建议的口气, 即 按我的想法应该如何; ought to语气更强, 强调有责任, 有义务做某事或者 按道理应该如何
a. I will start the work at once. I think you should start at once.
b. I will start the work tomorrow. No. You ought to start at once.
六.need的用法: need表示需要, 既可作为情态动词, 也可作实义动词
1.need作实义动词时, 注意以下用法:
①.need to do sth; ②.need sb to do sth; ③.need doing sth (主动形式表被动意义)
a. You need to remain in bed.
b. I need you to help me with the housework.
c. The garden needs watering.( =The garden needs to be watered.)
2.need作情态动词时, 多用于否定句及疑问句中, 不用于肯定句中
a. It is still early. You needn’t hurry. =You don’t need to hurry.
b. It is 11 o’clock. Need I go now? =Do I need to go now ?
3.对于用need的提问, 肯定回答用must, 否定回答用needn’t
a. Need I come? Yes, you must. / No, you needn’t.
七.dare / dared的用法: 表示 敢, 既可作为情态动词, 也可作为实义动词
1.作为情态动词时, 主要用于否定句和疑问句中, 不用于肯定句中
a. Little Jane dared not go alone. =Little Jane didn’t dare to go alone.
b. Dare you go out alone at night ? =Did you dare to go out alone at night ?
2.作为实义动词时, 可用于: dare to do sth
a. Little Jane didn’t dare to go alone.
b. Did you dare to go out alone at night ?
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