be open,当主语是三单时,open加s吗?如：The shopping mall is open at 9 o’clock.为什么open不加s?

分类: 作业答案 • 2022-02-05 20:44:59

问题描述：

be open,当主语是三单时,open加s吗?如：The shopping mall is open at 9 o’clock.为什么open不加s?
快

答

be动词后跟原形.在这里open是表语.要想加s这个句子就是The shopping mall opens at 9 0'clock