摘要:所谓定意义就是分析语境并确定应填情态动词的含义.如上文提到的高考题.就是通过定意义的方法来解题的.又如:例1: I told Sally how to get here.but perhaps I____ for her. A.had to write it out B.must have written it out C.should have written it out D.ought to write it out 析:选C.该题语境为:我仅仅口头上告诉莎丽如何来这儿.但也许我本应写张字条给她(这样她更有把握找到这儿).根据语境可知.我本应写张字条给她.而实际上没写.所以应用should have done或ought to have done表示“本应做--而实际未做-- . 例2: -Shall I tell John about it? -No.you____.I've told him already. A.needn't B.wouldn't C.mustn't D.shouldn't 析:选A.根据语境可知.我已将此事告诉了约翰.所以你没有必要再告诉他了.因此应填needn't表“没必要 .mustn't表“不准.禁止.严禁 .所以C为错误答案. 附:情态动词常见含义表: 情态动词 含义 can 能够,可以,可能 may 可以,可能 must 必须.应该,总是 will 愿意, shall 需要,必要.命令.禁止,允许 used to 过去常常 need 必要.必需 dare 敢 ought to.should 应该

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