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didn't need to do表示: 过去不必做某事, 事实上也没做。. needn't have done表示: 过去不必做某事, 但事实上做了。 John went to the station with the car to meet Mary, so...
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1) It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形, should 可省略。 句型: (1)suggested It is (2)important that…+ (should)...
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略,再把were, should或had 移到从句句首,实行倒装。 Were they here now, they could help us. =If they were her...
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1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。 a. 同现在事实相反的假设。 句型 : 条件从句 主句 一般过去时 should( would) +动词...
真实条件句用于陈述语气,假设的情况可能发生,其中 if 是如果的意思。 时态关系 句型: 条件从句 主句 一般现在时 shall/will + 动词原形 If he comes, he w...
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