表示與現(xiàn)在事實(shí)相反的情況時(shí), if從句的謂語用動(dòng)詞的過去式 (be動(dòng)詞的過去式多用were, 而不用was), 主句的謂語用should / would / could / might +動(dòng)詞原形 (should多用于第一人稱, would多用于二三人稱, could / might可用于所有人稱) a. If I had more time, I should study computer better. b. If he were not so busy, she would attend the meeting this afternoon. c. If they didn’t take exercises every day, they wouldn’t be so healthy. d. If you went to bed earlier, you would not be so sleepy in the morning. e. If she invited me, I should go to the party. 【查看更多】

 

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

當(dāng)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(dòng)詞be的某種形式時(shí)該主語和系動(dòng)詞可以省略。

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

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