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中, 過去式形式為dared。 What shall we do this evening? 2) shall 用于第二、三人稱,表示說話人給對方的命令、警告、允諾或威脅。should, ought to可通用,但在疑問句中常用should。 It would be about ten o’clock when she left home. 七、 should, ought to 1) should, ought to表示“應(yīng)該”,ought to表示義務(wù)或責(zé)任,比should語氣重。而need后面只能接帶to的不定式。 You must e in time. 在回答引出的問句時(shí),如果是否定的,不能用mustn’t(禁止,不準(zhǔn)),而用needn’t, don’t have to(不必). Must we hand in our exercise books today? Yes, you must. No, you don’t have to / you needn’t. 2) must是說話人的主觀看法, 而have to則強(qiáng)調(diào)客觀需要。 Can this be true? This can’t be done by him. How can this be true? 二、 may, might 1) 表示請求和允許。 Can you lift this heavy box?(體力) Mary can speak three languages.(知識) Can you skate?(技能) 此時(shí)可用be able to代替。如: He was able to go to th