公共英語各類條件句講解

時(shí)間：2023-03-06 00:20:24 公共英語我要投稿

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2017公共英語各類條件句講解

　　導(dǎo)語：條件句是指一種表示假設(shè)的主從復(fù)合句，一般由連詞 if 引導(dǎo)的條件從句引出某種假設(shè)，再由主句表示基于這種假設(shè)下的反饋。下面YJBYS小編講解公共英語�？嫉臈l件句，歡迎參考!

2017公共英語各類條件句講解

　　混合條件句

　　主句與從句的動(dòng)作發(fā)生在不同的時(shí)間，這時(shí)主，從句謂語動(dòng)詞的虛擬語氣形式因時(shí)間不同而不同，這叫做混合條件句。

　　If you had asked him yesterday, you would know what to do now.

　　(從句與過去事實(shí)相反，主句與現(xiàn)在事實(shí)相反。)

　　If it had rained last night (過去), it would be very cold today (現(xiàn)在).

　　虛擬條件句的'倒裝

　　虛擬條件句的從句部分如果含有were、should、或had可將if省略，再把were、should或had移到從句句首，實(shí)行倒裝。

　　Were they here now, they could help us.

　　=If they were here now, they could help us.　　Had you come earlier, you would have met him

　　=If you had come earlier, you would have met him.

　　Should it rain, the crops would be saved.

　　=Were it to rain, the crops would be saved.

　　注意：

　　在虛擬語氣的從句中，動(dòng)詞“be”的.過去時(shí)態(tài)一律用“were”，不用was，即在從句中be用were代替。

　　If I were you, I would go to look for him.

　　如果我是你，就會(huì)去找他。

　　If he were here, everything would be all right.

　　如果他在這兒，一切都會(huì)好的。

　　典型例題

　　_____ to do the work, I should do it some other day.

　　A. If were I　　 B. I were　C. Were I　D. Was I

　　答案C. 在虛擬條件狀語中如果有were, should, had這三個(gè)詞，通常將if省略，主語提前, 變成 were、should、had+主語的形式。但要注意，在虛擬條件狀語從句中，省略連詞的倒裝形式的句首不能用動(dòng)詞的縮略形式。如我們可說 Were I not to do，而不能說 Weren’t I to do.