no its not和no it isnt的区别

it isn't 强调在it上，强调是“它”不是，不是别的东西不是，it's not相反，强调是“不是”。

its not和it isnt用法是一样的，无太大差别。

例句：

Its not nearly as hot as last year.

天气绝没有去年那么热。

It isnt always easy to separate the wheat from the chaff.

分清好坏并不总是容易的。