介绍:
1. If I _ (be) you, I would accept his invitation.
2. If you _ (come) here yesterday, you would have met him.
3. You should have taken his advice, but in fact, you _ (not).
4. If the sun _ (rise) from the west tomorrow, I would marry you.
5._ he a bird (be), he would fly in the sky.
6. _ he studied hard, he would have passed the exam.
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