when is the bank open?

问题描述:

when is the bank open?
it is open in 8am其中open前为什么要加is.还是应回答it open in 8am 省掉is

正确的说法是
The bank opens at 8 a.m.
The bank is open at 8 a.m.
银行早八点开始营业.
两种说法都可以,前一种较好.在八点不用in而要说at 8