還原法
有些題目是以疑問(wèn)句、倒裝句、強(qiáng)調(diào)句、被動(dòng)句、感嘆句等形式出現(xiàn)的。解答此類(lèi)題時(shí)，可還原其本來(lái)面目，變回正常語(yǔ)序（陳述句或主動(dòng)語(yǔ)態(tài)），答案便一目了然。
Had they known what was coming next，they _______ second thoughts. （2012浙江卷）
A. may have B. could have C. must have had D. might have had
【解析】D.考查虛擬語(yǔ)氣。將 Had they… next 還原為 If they had known what was coming next，我們可以看出本題是考查與過(guò)去事實(shí)相反的虛擬語(yǔ)氣。對(duì)過(guò)去進(jìn)行推測(cè)時(shí)，從句形式為had done，主句形式為would / should / might have done.句意為：如果他們知道下一步會(huì)發(fā)生什么事情，他們也許會(huì)三思而后行的。
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