虚拟语气用法总结超好
概念:虚拟语气:表示说话人所说得不就是事实,而就是一种愿望、假设、或推测。
一、虚拟语气在 if非真实条件句中
  过去式    be --were
should / would/could / might + do
had done
should / would/ could / might + have done
过去式(be--were)should  dowere to do
should / would/could / might + do