表示與將來事實相反的情況時, if從句的謂語形式是: ①.完全動詞過去式 ; ②.should +動詞原形; ③.were to do. 其中②, ③種情況都含有“出乎意料之外 之意; 主句的謂語的形式是: should / would / could / might +動詞原形 a. If she should invite me tomorrow, I should go to the party. b. If it rained / should rain / were to rain tomorrow, our picnic would be put off. c. If I saw him tomorrow, I would pass your note to him. d. I might come back if I were to miss the train. 【查看更多】

 

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as if和as though引導的從句所敘述的情況與事實相反時，從句的謂語動詞多用虛擬語氣。在虛擬語氣結(jié)構(gòu)中，用________時態(tài)來表示現(xiàn)在的情形；用________時來表示過去的動作或狀態(tài)；用________時表示正在進行的動作；用________時表示將要發(fā)生的動作。

當as if和as though從句的主語和主句主語一致，且從句中含有系動詞be的某種形式時該主語和系動詞可以省略。

例如：John paused as if(he was)expecting Mary to speak．

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