第1个回答 2012-07-06
1. 现在
if + did (were), sub. + would / could / should / might + do
eg. If I were you, i would go to bed now.
2. 将来
if + did (were), sub. + would / could / should / might + do
eg. If i met him tomorrow, i would tell you.
3. 过去
if + had done, sub. + would / could... + have done
eg. If you had followed my advice, you could have recovered.本回答被网友采纳