3)動詞的語氣：

　　A.掌握非真實(shí)條件句中，謂語動詞在主句和條件句中的虛擬語氣形式。

　　If you had come earlier， you ______ (not miss) the first act of the play.

　　would not have missed

　　If it hadn‘t been for your help， we _____(be) in real trouble.

　　would have been

　　B.在表示建議、命令、要求以及表示“重要性”和“緊迫性”等含義的主語從句、賓語從句、表語從句和同位語從句中，謂語動詞常用虛擬語氣，由“動詞原形”或“should + 動詞原形”構(gòu)成。 should 常常省略

　　I would recommend that you _______(think) about doing something similar for yourself. (should) think

　　It was imperative that students ______(finish) their papers before July 1st.

　　(should) finish

　　C.動詞wish 、would rather (sooner)、if only、as if 后的虛擬語氣。

　　I would rather he _____(buy) the house next year.

　　bought ( 表示從句中動作尚未發(fā)生)

　　She treats me as if I ______ (be) a stranger. were

　　The manager told us to be friendly to the visitors as if we _____( meet) them before.

　　had met

　　If only we ______(have) a phone! I‘m tired of waiting outside the public phone box.

　　D.in case ， for fear that ， lest 等詞后從句的謂語動詞為(should) + 原形。

　　He took his umbrella with him lest it _______ (rain.)

　　(should) rain

　　E.在It is (high) time that 從句中謂語動詞一般用過去時動詞。

　　It‘s high time that we _______(take) firm measures to protect our environment. took

　　F.時間錯綜條件句，動詞的形式要根據(jù)表示的時間調(diào)整。

　　如果我們早動身，現(xiàn)在就不會在雨中走了。

　　If we had set out earlier，we wouldn‘t be walking in the rain.

　　(從句中動作發(fā)生在過去，主句中動作發(fā)生在現(xiàn)在。)

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