would 用于表示意志或意愿。will指现在,would指过去 I will never do that again. They said that they would help us. 表示“请求;建议”。用would比will委婉、客气些 Will you please take a message for him?Would you please pass him the book? 表示习惯性动作,译作“总是”“ 惯于” Fish will die without water. 表示预料或猜想 It would be about ten when he left home. 表示功能,译作“能”或“行” That will be all right. 用于否定句,表示“不肯”“不乐意” No matter what I said,he wouldn't listen to me. 情态动词 用法 例句 need 表示“需要;必要”,用于否定句、疑问句或条件从句中 You needn't ask him the question. Need I finish the work before ten? dare 表示“敢、敢于”,主要用于疑问句、否定句和条件从句中,一般不用于肯定句 Dare you go alone there? The boy daren't say so before the teacher. How dare he do such a thing? 情态动词 用法 例句 ought to
表示“应该” You ought to take care of him. 表示推测 He ought to be home by now. used to 表示过去常常(现在已经不再) There used to be a temple here. had better 表示“最好” You had better finish it now. 二、情态动词要点归纳 1.can与could的用法 表示“能力、许可、可能性”等。在口语中,can可以代替may表示许可,而may比较正式;could可以代替can,语气较为婉转。如: He is only four,but he can read. Can/Could I come in? Can the news be true? 2.may与might的用法 表示许可或征询对方许可,有“可以”的意思。用作此意时,它的否定形式可以用may not;但表示“不可以、禁止、阻止”等时常用must not(mustn't)代替may not。如: You may go now. He said that I might use the telephone. -May I watch TV after supper? -Yes,you may./No,you mustn't(may not/had better not). 表示可能性,有“或许、可能”的意思,“may或might+动词原形”都可以表示可能性。用might则语气更加不肯定。如: They may/might have a lot of work to do. 3.must与have to的用法 must表示“必须、应该”。否定形式must not(mustn't)表示“不应该、不许可、不准、禁止”等。在回答must的问句时,否定式常用need not(needn't)或don't have to表示“不必”,而不用must not,因为must not表示“禁止”。must表示“一定、必定”等推测意义时,一般只用在肯定句中。如:
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