i will be back 怎么有be 和back 两个动词啊

I'll be back home.中will和be都是be动词吗?为什么会有两个be动词呢? i will be right back和 i will be back right有什么区别? i will be right back和i will be back soon有什么区别? “I will be back! i will be back.i will back 有什么区别 I’ ll be back和i will be back 有什么不同 i will back 和i will be back 到底有什么区别? I will be back 怎么读 I will be back,from i will be back歌词 i will be back soon i will be coming back