I don't know if he __(come) if it ___(rain) tomorrow.请问第二个空该

I don't know if he __(come) if it ___(rain) tomorrow.请问第二个空该 I don't know if he ___(come) tomorrow.If he ____(come),I'll 为什么I don't know if it will rain tomorrow 英语急问：1.I don't know if it ___(rain)tomorrow.But if it ___(ra I don't know if he will come tomorrow. i don't know if __ tomorrow. I don't know if it will rain tomorrow,If it rains,we won't g I don't know if he will come tomorrow i think he if he free I don't know if he ( ) tomorrow I don't know if he ___.if he ____,please tell me .(come) i don't know whether it will rain or not .but if it __.i sha I don't know _____ it will rain tomorrow.A.if B wether 为什么?