四六級常考語法點預覽：

一、虛擬語氣

基本規則：

條件從句

主句

與現在事實相反

動詞過去式

should/would+動詞原形

與過去事實相反

had+過去分詞

should/ would +have+過去分詞

與將來事實可能相反

動詞過去式/were to/should

should/ would +動詞原形

與現在事實相反：

If I wereyou , I would apply forthe job.

與過去事實相反：

If I had taken your advice, I wouldn’t have made such mistake.

與將來事實相反：

If itrained tomorrow, I wouldstay at home.