为什么是We'll be back而不是We'll back?back不是可以做动词吗?

为什么是We'll be back而不是We'll back?back不是可以做动词吗? We'll Be Coming Back MP3连接 We'll ( ) on Sunday evening A、is back B、be back C、back D、are tomorrow we'll be back home意思是什么? U'll be back I'll be back 求We'll Be Coming Back -- Calvin Harris的可以用的空间链接! I(这是i) ' ll be back! I'll be back so 求i'll be back I’ll be right back 关于"I'll be back"