本文章由春喜在線英語于2017.6.15日編輯發布

虛擬語氣用于非真實條件句中有下列幾種情形：

1. 表示與現在事實相反的虛擬語氣，非真實條件句中的謂語動詞用“過去式(be動詞一般用were)”，而主句的謂語動詞用“would / should / could / might + 動詞原形”。如：

①If I were you I would stay here. 如果我是你，我就呆在這兒。

②We would go with you if we had time. 如果我們有時間，會和你一起去的。

2. 表示與過去事實相反的虛擬語氣，非真實條件句中的謂語動詞用“過去完成時”，而主句的謂語動詞用“would / should / could / might + have + 過去分詞”。如：

①If he had come here yesterday, I should have told him about it. 如果他昨天到這里來，我早就告訴他這件事了。

②If I had seen you yesterday, I would have asked you about it. 如果我昨天看到你，我就會問你這件事。

3. 表示與將來事實相反的虛擬語氣，非真實條件句中的謂語動詞用“過去式或should或were to + 動詞原形”，而主句的謂語動詞用“would / should / could / might + 動詞原形”。如：

①If it should rain this afternoon, the basketball match would be put off. 要是今天下午下雨，籃球比賽就延期舉行。

②If it were to snow tomorrow, they wouldn't go for an outing. 如果明天下雪，他們就不外出游玩。

4. 錯綜時間條件句中的虛擬語氣即當非真實條件句中表示的行為與主句表示的行為所發生的時間不一致時，動詞的形式要根據它所表示的時間做出相應的調整。如：

①If we hadn't been working hard in the past few years(過去), things wouldn't be so smoothly now(現在). 要是我沒有過去幾年的勤奮工作，那事情就不會有現在這樣平穩了。

②If you had worked hard yesterday(過去), you would be tired now (現在). 如果你昨天工作很辛苦的話，那你現在就會很疲勞的。