高中英语情态动词讲解课件(共29张PPT)

Grammar: Modal verbs How many modal verbs do you know? can could may might shall should must will would ought to have to dare (daren’t) need (needn’t) used to 表示推测 不表示推测 modal verbs 表示推测 １．一定，肯定　　 must 　　一定不，不可能　can’t, couldn’t ２．可能　肯定句 may ,might ,could 　　　　　否定句 may \might not 　　　　　疑问句 can ,could 　　都可以 + do sth.表示现在 be doing 表示正在发生的动作 have done表示过去发生的动作 He must have a car now. １.must表示推测时，可以推测现在/正在发生的动作/过去发生的动作。 　他一定有一辆车． 　他一定在教室里做练习。 　　他一定已完成了工作 He must have finished the work. He must be doing his exercises in the classroom. 　一定不，不可能 can’t couldn’t He can`t be at home. 　 He couldn't have said such a thing . 　　 　　他们一定不在图书馆读书。 　 　　约翰是很聪明的，他应该不会叫他儿子那样做。 　 They can`t be reading in the library John is very clever . He cannot have told his son to do that . ２．可能　肯定句 could , may ,might 　　　　　　否定句may \might not（可能不） 　　　　　　疑问句 can ,could 他可能正在睡觉。 　These students may / might have seen the film before.　　 否