1．当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时，被称为“错综时间条件句”，动词的形式要根据它所表示的时间作出相应的调整。如：
If you had followed my advice just now, you would be better now.
If you had studied hard before, you would be a college student now, and you would graduate from a college in four years’ time.
2．if 省略句
在条件句中可省略if, 把were, had, should提到句首 , 变为倒装句式。如：
If I were at school again, I would study harder.
→ Were I at school again, I would study harder.
If you had come earlier, you would catch the bus.
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