解析
首先否定句是 He doesn't want a bottle of water.或者完整写是 He does not want a bottle of water.然后句意是:他不想要一瓶水。
因为这句话里面没有be动词也没有情态动词can,根据实意动词 wants判断主语是第三人称单数并且句子时态是一般现在时,所以否定句在实意动词wants前面加入助动词doesn't 或者完整写是does not,实意动词还原为want。所以否定句是 He doesn't want a bottle of water.或者完整写 He does not want a bottle of water.(他不想要一瓶水。)
2. 拓展
(1)有 be ,be后面加 not
例一: He is my uncle .(他是我的叔叔)
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 uncle .(他不是我的叔叔。)
(2) 有 can,can后面加 not
例二: She can dance .(她会跳舞,)
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 dance .(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 go to the park .(她想要去公园。)
这句话 dances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 go to the park.
(4) and 变成 or,some 变成 any 。
这句话没有be 动词也没有情态动词,然后根据 help判断主语不是第三人称单数,并且时态是一般现在时。所以否定句在实意动词help前面加入助动词 don't ( do not ),其他照搬, 所以否定句是
My parents don't / do not help me clean the room.“我父母不帮我打扫房间。”
3. 拓展训练
(1) I am a student.
否定句:I am not a student.
(2) She likes cats.
否定句:She doesn't / does not like cats.