题目内容
18．Bob sends emails to his friends everyweekend．（改为否定句）Bobdoesn'tsend emails to his friends every weekend．
分析 鲍勃每个周末都发邮件给他的朋友们．
鲍勃不是每个周末都发邮件给他的朋友们．
解答 答案：doesn't send．
原句中实意动词sends得知是一般现在时，转换成否定句时借助于助动词，Bob是第三人称单数，故doesn't，助动词后应跟上动词原形，故答案是doesn't send．
点评 本题考查肯定句变否定句，做此类题时，需在句子相对应的助动词后加not，若动词为三单或过去时，动词需还原成原形．
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