首先,要知道虛擬語氣是什麼個定義.

虛擬語氣用來表示說話人的主觀願望或假想,所說的是一個條件,不一定是事實,或與事實相反哦.

條件句可分為兩類,一類為真實條件句,一類為非真實條件句.

非真實條件句表示的是假設的或實際可能性不大的情況,故採用虛擬語氣.

真實條件句

真實條件句用於陳述語氣,假設的情況可能發生,其中if是“如果”的意思.

If he comes,he will bring his violin.

非真實條件句

時態：可以表示過去,現在和將來的情況.它的基本特點是時態退後.

a.同現在事實相反的假設.

一般過去時：should(would)+動詞原形

If they were here,they would help you.

b.表示於過去事實相反的假設

過去完成時：should(would)have+ 過去分詞

If he had not been ill and missed many classes,he would have made greater progress.

含義：He was ill and missed many lessons,so he did not make greater progress.

c.表示對將來的假想

一般過去時：should+動詞原形/

were+不定式

/would+動詞原形/

should+ 動詞原形

If you succeeded,everything would be all right.