初三知识need用法.pptVIP

1. The animals we eat have to spend their lives living in tiny spaces. 我们吃的那些动物不得不在狭小的空间里度过一生。 You need to become a vegetarian too. 你必须也成为一名素食者。 我们可以用have to+v或need to+v来表示“必须做某事” We\They\You have to eat meat. We\They\You don’t have to eat meat. He\She\It has to eat meat. He\She\It doesn’t have to eat meat. We\They\You need to eat meat. We\They\You don’t need to eat meat. He\She\It needs to eat meat. He\She\It doesn’t need to eat meat. We need to eat meat. 否定：We don’t need to eat meat. 疑问：Do you need to eat meat? 肯\否回答：Yes, we do.\No, we don’t. He needs to eat meat. 否定：He doesn’t need to eat meat. 疑问：Does he need to eat meat? 肯\否回答：Yes, he does.\No, he doesn’t. 他不需要赶快。→ He doesn’t need to hurry. He needn’t hurry -他需要赶快吗？ -是的，他需要。\不，他不需要。（用need to造句） -Does he need to hurry? -Yes, he does.\No, he doesn’t. --Need he hurry? --Yes, he must.\No, he needn’t. “need” 既可以作情态动词，也可以作实义动词 作为情态动词时，后+动词原形，第三人称单数现在时没有词形变化 。表示“需要”或“必须”，通常用于否定句和疑问句 Eg) You needn’t do it again．你不需要再做了。 Need he do this homework first？他需要先做这些作业吗？ “need”作为实义动词时，通常用法是： ①人＋need ＋to do Eg) We need to tell him the truth．我们需要告诉他真相。 ②物＋need ＋doing =物＋need ＋to be done Eg) My car needs repairing．我的汽车需要修理。 =My car needs to be repaired 另外，“need”后还可以直接跟名词。 Eg) It is a question that needs very careful consideration． 这是一个需要慎重考虑的问题。 -Need I ……? -Yes, you must.\No, you needn’t. -Must I ……? -Yes, you must.\No, you needn’t.