I couldn't underst and why they were all laughing

发布时间:2021-03-12 11:49:59

I couldn't underst and why they were all laughing at me.为什么laugh要加ing

网友回答

前面有系动词were(are)后面的动词变成名词加ing
======以下答案可供参考======
供参考答案1:
这是个过去进行时态
进行时是由be加动词现在分词形式构成的
这里的be就是were,后面当然要加动词的现在分词
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