只是说,虚拟从句中有一类是由if引导的.虚拟条件句（Sentences of Unreal Condition）：当假设是不大可能实现时,就是虚拟条件句.例如：⑴、If I were you ,I would have attended the meeting.如果我是你的话,就去参加会议了.⑵、If he had come here yesterday,he would have seen his old friend.假如他昨天来这儿的话,就会看见他的老朋友.⑶、If it had rained yesterday,we would have stayed at home.如果昨天下雨的话,我们就会留在家里.
