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If I had a bike, I would lend it to you.(if 从句用过去时, 主句用should/ would/ could/ might+ 不定式)
If he had been here, he would have helped you.( 从句过去完成时, 主句should /would/ could/ might + 不定式完成时)
If I had a bike, I would lend it to you.(if 从句用过去时, 主句用should/ would/ could/ might+ 不定式)
If he had been here, he would have helped you.( 从句过去完成时, 主句should /would/ could/ might + 不定式完成时)
