作业帮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
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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
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
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
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
Open 在这里是形容词，动词才有第三单形式。
The shopping mall is open at 9 o’clock. 这个句子里面的open是形容词 不是动词，表状态.
这个句子的open是动词，she often opens the door.的要加S.
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
be open
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Open to,open for,be opened to,be opened for 意思和用Open to,open for,be opened to,be opened for 意思和用法还有主语各是什么
Let's open the door!的主语
be open,be closed,open,close 它们的区别