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 Werent I to do.