he teachers me english变为否定句？
否定句是He doesn't / does not teach me English.
一、解析
首先这句话没有be 动词也没有情态动词，然后根据 teaches 判断主语是第三人称单数，并且是一般现在时。所以否定句在实意动词teaches前面加入助动词 doesn't （ does not ），动词还原为 teach 所以否定句是
He doesn't / does not teach me English.（他不教我英语。）
二、拓展——变句思路
（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 teaches 判断主语是第三人称单数，并且是一般现在时。所以否定句在实意动词teaches前面加入助动词 doesn't （ does not ），动词还原为 teach 所以否定句是
所以否定句是 He doesn't / does not teach me English.（他不教我英语。）
三、拓展训练
把下面句子改为否定句
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.
首先更正一下，正确的应是“teaches ”而不是“teachers ”。
原句：He teaches me English.（他教我英语。）
改为否定句：He doesn't teach me English.（他不教我英语。）
英语中陈述句改为否定句怎么改？
1、句中有be动词(am/is/are/was/were)的，在be动词后加not。
如：I can swim.——I can't swim.
He is a math teacher. → He is not a math teacher.
2、句中有情态动词的(can/should/must/would)，在情态动词后面加not;
如：There will be a new building next year. → There will not be a new building next year. (will not可以缩写为won’t)
3、句中没有be动词和情态动词的，在动词前加don’t或doesn’t
① 句中动词为原形的，加don’t .如： I like apples. I don’t like apples.
②句中动词为三单式的，加doesn’t，并将三单式的动词还原成原形。
如：He likes apples. He doesn’t like apples.
4、肯定句中的some在否定句中应改为any
如：There are some students in the classroom. There are not any students in the classroom.
特殊形式的否定句：
(1)肯定句含有every-的合成词时，变否定句时改为no-。
如：Everything is ready.→Nothing is ready.
(2)肯定句中含有always， usually和ever时，变否定句时改为never。
如：He is always late for school.→He is never late for school.
(3)肯定句含有many，much时，变否定句时分别改为few，little。
如：Many students know him.→Few students know him.
(4)肯定句中含有still时，变否定句时应改为no longer。
如：Tom is still in bed.→Tom is no longer in bed.
(5)肯定句含有both， both...and，all时，变否定句时应改为never，neither...nor，none。
如：Both of us are students.→Neither of us is a student.
(6)肯定句含有nearly， almost时，变否定句时应改为 hardly。
如：Lily nearly knows him .→Lily hardly knows him .
(7)肯定句含有“形容词+ enough”时，变为否定句时应改为“too +形容词的反义词”。
如：He is short enough to reachit.He is too tall to reach it.
he teachers me english。/ 他教我英语。
否定句：
He doesn't teach me English. / 他不教我英语。
这句话的谓语动词应该有误，正确的应该是teaches。由这个单三形式的谓语动词可以看出原句时态是一般现在时，由陈述句变为一般疑问句，需要借助动词does和否定副词not。使用了助动词does之后，谓语动词要恢复成原形teach。
He doesn't teach me English.
He doesn't teach me English
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