I don’t know if i will be free tomorrow.if i am free,i will fly to beijing with my daughter.为什么第一个句子用将来时?不是IF后现在时吗?

英语翻译i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know if i should i don't know I don't know. I don't know if he ____(be) free tomorrow. what if I don't know anyone 的意思 You don't know even if I vanish from your what if I don't know anyone?同义句转换 What,I,anyone,don't,if,Know连词成句 What,I,anyone,don't,if,Know,连词成句 I don't know if he ____ ( come ) Hao can i know ,if you don't say “i don't know you know i don't know I don't know is whatI don't know if I can still not able to persistDon't know if I couldDo not know What if I don't know anyone?同义句What __ __ __ if I don't know anyone I don't know if I will go there.I don't know ___ ____ go there. I don't know if he_.if he _home,please let me know.(return). I don't know if he will come tomorrow i think he if he free I don't know if it------tomorrow,but if it-----,I'll go swimming But I don't know if I think too much.为什么要把 if 改成whether?