There are a lot of changes happened around us对么?

There are a lot of changes happened around us对么?

题目
There are a lot of changes happened around us对么?
happen是不及物动词啊,怎么能加ed呢?如果是过去时也是前面的be动词变化啊,我不懂了……请大家解答一下呢……
答案
补齐句子就是:There are a lot of changes(which have) happened around us
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