求英语高手，什么情况下在句子中用isn't，什么时候用don't，求说明！！

\u8ba8\u8bba\u53e5\u5b50 i don't think i'm imporoving \u4e2d\u7528\u4e86\u82f1\u8bed\u4e2d\u7684\u54ea\u6761\u8bed\u6cd5\u89c4\u5219

\u5426\u5b9a\u524d\u79fb\u3002\u9700\u8981\u5426\u5b9a\u524d\u79fb\u7684\u8bcd\u8fd8\u6709\uff1abelieve ,expect ,guess ,purpose \u7b49\u3002

\u7948\u4f7f\u53e5\uff1a
Don't shout
Don't smoke
Don't litter.
Don't fight.
Don't lie.
Don't bring anything dangerous.
\u901a\u5e38\u60c5\u51b5\u7528NO
No shouting.
No smoking.
No littering.
No fighting.
No lying.
No bringing anything dangerous.
\u5f62\u5bb9\u8bcdno\u540e\u9762\u78b0\u5230\u52a8\u8bcd\u8981\u7528\u52a8\u540d\u8bcd\u7684\u5f62\u5f0f

is是be动词，而do是助动词，简单来说就是如果句子中有be动词，则用isn't，没有则添加助动词然后变为否定don't。如果还不清楚，我再说个别的理解方法，比如我做作业，就是I do homework，我是学生，I am student，在英语里一个句子不能有2个动词，而be动词的意思为:是，所以我做作业就不能用be动词，这时候就用行为动词，而句子中没有be动词，所以在变否定时就要添加助动词

is的否定形式是isn't，翻译为“不是..”但是经常就不翻译出字面意思来。
这个时刻就看句子的谓语是什么。如果是有实在意义的动词，那么该句子的否定形式是：动词还原，前面加don't.

isn't用于形容词，比如it isn't important(它不重要）don't作助动词比如i don't play it(我没玩它）

回答的时候，问句中有do,就用don't，其他情况就，实义动词，就用don,t

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