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请问if 引导的条件状语从句有几种形式

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请问if 引导的条件状语从句有几种形式
1.主将从现 I will help you if you help me.
2.主现从现 If you help others,they are likely to help you in return.
3.虚拟 If I were you ,I would not do that.
If I had been you,I would have gone there.
If I were/ should be/ were to be you ,I would go there.