C.省略if的条件句 在书面语中,非真实条件句中有were, had, should时,可以省略if,而把were, had, should放在主语前,用倒装结构。 Were it necessary, I might go without delay. 如果需要的话,我可以立即去。(= If it were necessary......) Had you taken my advice, you wouldn't have failed in the exam. 你要是听了我的建议,就不会考试不及格了。(= If you had taken my advice......) Should I have time, I would call on her. 要是有时间,我就去看她。(= If I should have time......)
D.错综条件句 虚拟条件句中的主句和从句涉及的动作发生的时间不一致,这时主句和从句的谓语形式应按照各自动作发生的实际时间来表达。 If you hadn't watched TV yesterday, you wouldn't be so sleepy now. 如果你昨天不看电视,你现在也就不会这么困了。(从句yesterday说明过去,主句now说明现在) If they had left home early this morning, they would arrive in half an hour. 如果他们今天一早就离开家的话,再过半小时他们就该到了。(从句说明过去,主句说明将来。) If you hesitated this moment, you might suffer in the future. 如果你此刻犹豫不决,你将来会吃苦头的。(从句说明现在,主句说明将来) 注意: 在很多情况下,我们也可以用was来代替当主语是第一人称或第三人称单数时的were。 If were here tomorrow... 也可以说成:If he was here tomorrow... I wish I were a bird. 也可以说成:I sish I was a bird.
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