He told Tom not to smoke in the meetin为什么不是didnot而是not呢？

Don not eat in the classroom ,Tom.(\u4e0ethe teacher told\u5408\u5e76\u4e3a\u4e00\u53e5\uff09 the teacher told__ __ ___ eat in

The teacher told Tom not to eat in the classroom.

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that \u4e00\u822c\u53ef\u4ee5\u7701\u7565

这是因为不是否定谓语，英语中只有否定谓语才用助动词don't,doesn't和didn't。
not to smoke是动词不定式的否定。
tell sb not to do sth告诉某人不做某事
don't tell sb to do sth不要告诉某人做某事
两个结构意思不一样。

因为 这里后面不是一个句子
你那样理解的话
应该是：He told Tom that did not smoke in the meeting。这是宾语从句的概念了
tell sb （that）接从句 其中that可省略
这里的He told Tom not to smoke in the meeting 是用的tell sb （not）to do结构，“叫某人（不要）做某事”的意思

楼主注意区别哈！希望对你有所帮助。

tell sb not to do sth 叫某人不要做某事，所以用not，用didn't的话要改为
He told Tom he didn't/can't smoke in the meeting room

固定句型：
肯定：Somebody tell Somebody to do

否定：Somebody tell Somebody not to do

有问题可以追问。

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