事故发生的时候,我坐在车子的后座,因为汤姆的小儿子坐在前边他的身旁。要是汤姆的孩子没坐在那里的话,我就会坐在前面了。
3 可以在if从句中用过去完成进行时:
I was wearing a seat belt.If I hadnt been wearing one Id have been seriously injured.
我当时系了安全带。要是没有系上的话,我就会受重伤了。
4 可以把类型2和类型3结合起来:
The plane I intended to catch crashed and everyone was killed.If I had caught that plane I would be dead now/I would have been killed.
我原想赶乘的那架飞机坠毁了,所有乘客都遇难身亡。要是我赶上了那架飞机,我也就没命了/我就会摔死了。(类型 3)
If I had worked harder at school I would be sitting in a comfortable office now;I wouldnt be sweeping the streets.
要是在上学时学习再努力一些,我现在就会坐在舒适的办公室里,而
不会是在扫大街了。(但我上学时不努力,因而我现在在扫大街。)
5 had可以位于句首并省略if:
If you had obeyed orders this disaster would not have happened.相当于:
Had you obeyed orders this disaster would not have happened.
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