小升初英语虚拟语气（二）不用 if 的条件从句结构 在笔语中，条件从句有时可以不用连词小而把 were，had 或 should 移至主语之前。但如从句没有 were，had 或 should，则一般不能这样做。如： Should he come，tell him to ring me up.他要是来了，让他给我打个电话。 Were I in your position，I would go.如果我处于你的地位，我就去。 Had they not helped us，our experiment would have failed. 如果没有他们的帮助，我们的试验是会失败的。 [注]有时虚拟条件不用条件从句而用介词短语、动词不定式等来表示。如： without contradiction nothing would exist. 没有矛盾就没有世界。 We could not have done the work well without your help.要是没有你的帮助，我们不可能做好这工作。 It wonld be a good idea to go swimming at the summer palace.到颐和园去游泳，倒是个好主意。 All this would have been impossible ten years ago.这一切在十年前是不可能有的。 虚拟语气和情态动词 虚拟结构(不论从句或主句)常可用情态动词的过去式，即 could，might，wou1d 等加不带 to的动词不定式或不带 to 的动词不定式完成式，来作谓语动词。这些情态动词除表示虚拟结构外，本身还有独立的意思。如： If I were you，I Would go.我如果是你，我就愿意去。 If he were here，he might agree with you.假如他在这里，他可能会同意你。 I Would help you if I could. 假如我能够的话，我一定帮助你。 If it had not been for their help，we could not have succeeded. 如果没有他们的帮助，我们是不可能成功的。 有时条件从句中的动作和结果主句中的动作所发生的时间不一致。这时，动词的形式应根据它所表示的时间加以调整。如： If he had followed the doctor's advice，he Would be quite all right now.他当时若是听医生的话，现在就会痊愈了。(从句说明过去，主句说明现在) If I were you，I Would have gone to the theatre.假如我是你，我会去看话剧了。(从句的时间包括现在，主句说明过去) If you hadn't helped me，I couldn't have finished it on time and most likely I would be still working now.假若你没有帮助我，我不可能按时完成工作，很可能现在还在干哩...
