Tom+can+finish+his+job 改为否定句？
否定句是 Tom can't/can not finish his job.（汤姆不能完成他的工作。）
一、解析
首先改否定句要找原句有没有情态动词和be动词，这句话有情态动词 can，所以否定句在情态动词 can后面加入not ，即can't（ can not ），所以否定句是
Tom can't/can not finish his job.（汤姆不能完成他的工作。）
二、拓展——否定句变句思路
（1）有 be ，be后面加 not
例一： He is my teacher .（他是我的老师）
这句话里面有be 动词 is，否定句在 be 动词 is 后面加not，is not 可以完整写，也可以缩写为 isn't
即 否定句：He is not / isn't my teacher .（他不是我的老师。）
（2） 有 can，can后面加 not
例二： She can sing .（她会唱歌，）
这句话里面有情态动词 can，所以否定句在can 后面加 not ，can not 可以完整写，也可以缩写为 can't
即 否定句：She can not / can't sing .（她不会跳舞。）
（3）无 be 无 can找实意动词，前面加don't 或 doesn't，此时动词需要还原
例三： She wants to play football.（她想踢足球。）
根据 wants判断句子一般现在时，并且第三人称单数，所以实意动词 wants 前面加入找动词 doesn’t ，动词还原为want
即 She doesn't want to play football.
（4） and 变成 or，some 变成 any 。
这句话有情态动词 can，所以否定句在情态动词 can后面加入not ，即 can't（ can not ），所以否定句是
Tom can't/can not finish his job.（汤姆不能完成他的工作。）
三、拓展训练——把下列句子改为否定句
My mother can dance.
否定句：My mother can't/can not dance.
She likes singing.
否定句：She doesn't/does not like singing.
Tom+can+finish+his+job 改为否定句？
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Tom can't finish his job.
勤学好问 天天进步！ 开心快乐每一天！
Tom+can't/ cannot+finish+his+job.
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