happen 有一般过去式子吗。比如what happens,关于happen
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happen 有一般现在时、一般过去时、现在完成时
如what often happens to you?
what happened to you yesterday?
what has happened to you?
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因为句子後面是用现在进行式, 那你之前不可能用其他tense
A: 因为是过去式所以否决
C: 如果是动词的话, 凡是-ing前面都要加一个is/are/was/were. 这里没有所以否决.
D: All of this 可以译作 "这", 是复数, 所以动词後面要加s.