I will be free tonight 中be free是什么结构?

I will be free tonight 中be free是什么结构? ---your mother ---(be) free tonight? they什么be free tonight _____comes will be welcome.Everything is free tonight. will you be free Everything will be free:" will free还是 will be free为什么 I don’t know if i will be free tomorrow.if i am free,i will Will you be free toning? She Will Be Free 歌词 Will you be free tomorrow. I am free tonight