if后加真实语气（虚拟语气）的句型,结构
1个回答

1.if you want/like 如果你愿意的话

You can come and stay with us if you want.

2.if so如果是的话

Are you planning to return to work,and if so,who is going to look after the baby?

3.if not如果不是的话

Has anyone dealt with the technical problems?And if not,why not?

4.if necessary/if possible 如果必要/可能的话

We are ready to fight for our rights if necessary.

I should like to be back here by 10:30 if possible.

5.even if即使

I’d rather never sell this painting,even if they offered me a million dollars.

6.what if 要是……,那怎么办?如果……那会怎样?

What if the boss walked in here now and saw us?

7.as if好像是……

She always talks to me as if she was my sister.

就这么些结构了,总结一下.当IF对现在虚拟,从句用过去时,主句用should/would/could/might+V原形.当IF对过去虚拟的话从句要用过去完成时,主句用should/would/could/might+have done.

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