2. 非真實(shí)條件句

　　1)虛擬語氣可以表示過去，現(xiàn)在和將來的情況，時(shí)態(tài)的基本特點(diǎn)是往后推移一個(gè)時(shí)態(tài)。

　　A. 與現(xiàn)在事實(shí)相反的假設(shè) 條件從句+主句

　　一般過去時(shí)(be用were) should(would)等 +動(dòng)詞原形

　　例如：If they were here, they would help you. 如果他們在這兒，會(huì)幫助你的。

　　含義：They are not here, they can’t help you.

　　B. 與過去事實(shí)相反的假設(shè) 條件從句+主句

　　過去完成時(shí) should(would)等+ have+ 過去分詞

　　例如：If he had come yesterday, I should / would have told him about it.

　　如果他昨天來的話，我會(huì)把這件事告訴他的。

　　含義：He did not come yesterday, so I did not tell him about it.

　　C. 表示對(duì)將來不大可能發(fā)生的事情的假想 條件從句+主句

　　一般過去時(shí) should/would等 + 動(dòng)詞原形

　　were+ 不定式

　　should+ 動(dòng)詞原形

　　例如：If you succeeded, everything would be all right. 如果你將來成功了，一切都會(huì)好的。

　　If you should succeed, everything would be all right.

　　If you were to succeed, everything would be all right.

　　含義：You are not likely to succeed, everything will be what it is now.

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