a. It is still early. You neednt hurry. =You dont need to hurry.
b. It is 11 oclock. 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neednt
a. Need I come? Yes, you must. / No, you neednt.
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 didnt 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 didnt 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
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