that it is!和that's it!

that it is!和that's it!
that it is!和that's it!

that it is!和that's it!
that it都是代词,代词不可连用,除非that后面是从句.
that's it语法没毛病,是正确的.
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只有that's it是正确的

前一个口语，后一个书面语

举两个例子吧,that it is wrong 那是错的
that's it在不同情况下一时也不同,比如:that's it 那就对啦;
That's how it goes 事情就是这样的