I don't know if he is ( )class five.

I don't know if he ( ) tomorrow He is very busy.I don't know if he will come or not tomorrow don't where he I know is 英语翻译I don’t know who this gentleman is． but if he reads this I don’t know ___________ he is well or not.whether/if,为什么? i don't know What class is she in 改错 I don't know if he ( ) If he ( ) .I'll let you know I don't know if he will come tomorrow. I don't know if he ____(be) free tomorrow. i don't know if he comes next week I don′t know if he come this afternoon （I don't know if he ___here nxt week.)