1.與現(xiàn)在事實(shí)相反的虛擬語(yǔ)氣,基本結(jié)構(gòu)為:主語(yǔ)+動(dòng)詞的一般過(guò)去時(shí)(be動(dòng)詞用were)+其他成分+if+should/would/could...+動(dòng)詞原形+其他成分。例如:
①I(mǎi)f it were not for the fact that she ______ sing,I would invite her to the party.
A.couldn't B.shouldn't C.can't D.might not
解析 句意為:如果不是因?yàn)樗粫?huì)唱歌的事實(shí),我會(huì)邀請(qǐng)她來(lái)參加那次聚會(huì)的。that從句為同位語(yǔ)從句,描述的是事實(shí),用陳述語(yǔ)氣。正確答案為C。
2.與過(guò)去事實(shí)相反的虛擬語(yǔ)氣,基本結(jié)構(gòu)為:主語(yǔ)+動(dòng)詞的過(guò)去完成時(shí)+其他成分+if+should/would/could...+have done+其他成分。例如:
If the weather had been better,we could have had a picnic.But it ______ all day.
A.rained B.rains C.has rained D.is raining
解析 句意為:如果天氣好的話,我們是能夠去野餐的,但是下了一天的雨。句子前半部分陳述的是與過(guò)去事實(shí)相反的事情,所以用了虛擬語(yǔ)氣。"下了一天的雨"是事實(shí),所以用陳述語(yǔ)氣。因?yàn)槭前l(fā)生在過(guò)去的事實(shí),所以正確答案為A。