I don′t know if comes back this afternoonI don′t know if comes back this afternoon.这句话有错误吗?请问错在哪里?该怎么改?

I don't know if he ____ ( come ) I don't know if Mr.Green_______(come) tomorrow,but I will let you know if he _____(come) tomorrow I don't know if he will come tomorrow i think he if he free I don't know if he______tomorrow,If he_____i will meet him.(come) I don't know if he will come tomorrow.为什么要用if 不能用whether i really don't know if he _____tomorrow.if he_____,please give me a ring(come) I don't know if he ___.if he ____,please tell me .(come) I don't know if he ___(come) tomorrow.If he ____(come),I'll tell him about it I don't know if I'll be able to come. I don't know if you will come tomorrow ,if you come please call me怎么翻译? I don't know if Susan __.If she__,call me.place.A:will come;will come B:comes;come C:comes;will come D:will come;comes I don′t know if he come this afternoonI don′t know if he come this afternoon.请问该错误的原因是什么,该怎么改呀? I don,t know if your father__________(comes back/will come back) I don't know _________he will come or not tomorrow.________he come,I will tell you.a.if If b.if Whether c.whether If d.whether Whether i don't know if Mr.Li.to the party.i think he will come if he ...freeAwill come;is Bwill come;will be I don't know if ny uncle If he I will be very happyA comes ；will comeB will come ；will come C comes； comesD will come；comes i don't know if lucy will come to see me in five days.从句中为什么用“wiil come”? I don't know if he __(come) if it ___(rain) tomorrow.请问第二个空该怎么解释?