I declare this exhibition open.这句话open前面不应该加个is吗?

look,the door is open,为什么open不加ing? I declare the meeting open.这应该是一个从句吧?那为什么open不用单三的形式? i declare the meeting open这是什么用法啊,怎么没有be动词? I hold open the door这句话语法有误吗 This shop is open from 7 am to 9 pm.中的open为什么不能用opening open 是名词吗前面要加a吗 Can I leave this door open at night这句话怎么理解? I didnt dare open a window这句话话对吗?为什么不在dare后面加to? be open,当主语是三单时,open加s吗?如：The shopping mall is open at 9 o’c As __ chairman of __ committee, I declare the meeting open. How long has this factory been open这句话转变成这样可以吗 Is the shop open,要加ing吗