虛擬預期在條件句中的應用：

1： If i were you , i would make better use of time at school.

如果我是你，我會更好地利用在學校的時間。

2：If you had taken your teacher’s advice ,you wouldn’t have failed in the exam .

如果你早聽老師的話，考試就不會不及格。

3：If it should rain ,we would change our plan.

萬一下雨的話，我們就改變計劃。

用法

條件從句的謂語動詞 主句的謂語動詞

與現在事實相反 動詞過去式 SHOULD+動詞原形

WOULD+動詞原形

與過去事實相反 HAD+過去分詞 SHOULD HAVE +過去分詞

WOULD HAVE +過去分詞

與將來事實可能 動詞過去式 SHOULD+動詞原形

相反 SHOULD+動詞原形 WOULD+動詞原形

WERE TO+動詞原形

注、：1在主句中SHOULD 用于第一人稱，WOULD 用于任何人稱。

2主句中可用COULD，MIGHT代替SHOULD WOULD。

3條件從句中一律用WERE，在口語或非正式語句中用WAS。但“IF I WERE YOU…… ”是固定說法