题目内容
4．She did her homework yesterday （改为否定句）Shedidn't doher homework yesterday．
分析 她昨天做作业了．
她昨天没有做作业．
解答 答案：didn't do．
原句did是do的过去式，借助于did后加not构成否定，后加动词原形do，故答案是didn't do．
点评 含有be动词，情态动词或者助动词have/has的句子转化成否定时在其后面加上not，一般实意动词的否定式，通常应根据不同时态和人称在实意动词之前加don't，doesn't，didn't等．
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One afternoon，I was practicing a new dance in my room，when Nancy walked（19）D．
"What's the matter，Nancy？"I stopped（20）D．
"Nick，you are a great dancer!Can you help me？"
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In the following months，we（24）Devery evening，hiding from my parents．I was having a fantastic time and soon Nancy improved a lot．
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I'd been waiting for this moment for so long．（30）BI knew that the road ahead wasn't going to be easy，I wouldn't give up．I wanted nothing more in life than to dance．
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| 30．A．As | B．Though | C．If | D．Unless． |
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