一句话，谁能给分析一下语法

there's so much that has gone on in the last few months .

可以看出是一个there be句型, 所以's是is ~~~
时态嘛~~~“that has gone on in the last few months”是so much 的定语从句，用于修饰so much 的。。。。。has gone是现在完成时。。。。不过既然主句是“there is ....”，那主句的时态就是一般现在时

再举例：
1.There is a tree that has grown in my garden since I was a child.
2.She is a student who has been in the USA for over 4 years.
这些都是主句是一般现在时，定语从句是现在完成时的句子

过去时，that has gone on 修饰much

主干是there's so much in the last few months.
从句是现在完成时,主句是过去时从后边last few months可知
所以's =was

例如there's so many exams that has gone on in the last few months.

1.这句话出处哪里？可靠吗？好像是说：在上几周内，发生了太多的事。
2.so much 是主语，there is 是谓语，that has gone on in the last few months是定语从句。

这个句子分开来看
先是一个there be句型，was是不能缩写的~that后面是定语从句，修饰much。
句意：在过去的几个月里还有很多事情在继续~

http://epizza.open.edu.