I could get you a book. I could not / couldn\'t get you a book.
【技巧2】当句中含有系动词was,were 时,可直接在其后加not构成否定句。例如:
I was at home when you called me. I was not / wasn\'t at home when you called me.
【技巧3】当句中谓语是除情态动词、助动词、系动词was, were以外的动词时,在该动词之前加did not / didn\'t,动词还原,构成否定句。例如:
The singer sang some Chinese songs. The singer did not / didn\'t sing any Chinese songs.
二变:陈述句变为一般疑问句
【技巧1】移动词语的位置。将was,were, could,would,should等移到句首。例如:
He could read it . Could he read it ?
【技巧2】添加助动词did。谓语是除情态动词、助动词、系动词was, were以外的动词时,在主语之前加did,动词还原。例如:
Miss Zhang looked very old. Did Miss Zhang look very old?
三变:陈述句变为特殊疑问句
【技巧1】确定疑问词:人who / whom,物what,地点where,时间when / what time,原因why,频率how often,长度how long,距离how far等等。例如:
They gave the mooncake last night. When did they give the mooncake?
【技巧2】辨认结构形式:疑问词+情态动词/助动词/ was / were / did +主语+...? 例如:
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