题目内容
19．He has to finish the work first everyday．（否定句）Hedoesn't have to finish the work first everyday．
分析 他每天都必须先完成作业、
他没有必要每天先完成作业、
解答 答案：doesn't have．结合has to是一般现在时，借助于does构成否定句，后加动词原形have，故答案是doesn't have．
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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| 17．A．sad | B．surprised | C．excited | D．glad |
| 18．A．good | B．important | C．interesting | D．bad |
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