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一句话,there's so much that has gone on in the last few months这

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一句话,
there's so much that has gone on in the last few months
这是什么时态啊?还有那个缩写 's 是is还是was?然后再举几个其他的例子,
一句话,there's so much that has gone on in the last few months这
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