小學(xué)生需要掌握的英語語法知識點：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，動詞‘be’的過去時態(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，就會去找他。

　　If he were here， everything would be all right.

　　如果他在這兒，一切都會好的。

　　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.