If you _____ (come) yesterday, you _____ (meet) him.
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If he _____ (have) time now, he _____ (attend) the meeting.
If he _____ (be) to succeed, the sun would rise from the west.
If she _____ (be not) so busy, she might have helped you.
_____ you fail this exam, you can always re-take it next year.