表虛擬條件用法就是if加主句動(dòng)詞過(guò)去式或者be動(dòng)詞過(guò)去式，舉例就是if i were you, i would go. 表示與現(xiàn)在事實(shí)相反條件句是if加主句動(dòng)詞過(guò)去式，主句就用would/should/could/might加動(dòng)詞原形，比如if he were here now, he would help us. 表示與過(guò)去事實(shí)相反，條件句用過(guò)去完成時(shí)，主句用would/should/could/might加have加過(guò)去分詞，例如if she had listened to me, she would have passed the exam.

1. 表示與現(xiàn)在事實(shí)相反的情況，從句謂語(yǔ)用一般過(guò)去時(shí)。 2. 表示與過(guò)去事實(shí)相反的情況，從句謂語(yǔ)用過(guò)去完成時(shí)。 3. 表示對(duì)將來(lái)的推測(cè)和假設(shè)，從句謂語(yǔ)用would/could/might/should動(dòng)詞原形。

表假設(shè)，主句用虛擬式從句實(shí)際過(guò)去用過(guò)去式實(shí)際現(xiàn)在用were加動(dòng)詞原形實(shí)際將來(lái)用were加should加動(dòng)詞原形表建議讓步從句用虛擬式主句用一般現(xiàn)在式