为什么I don't know if is polite to speak loudly at the table中if不用that

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 But I don't know if I think too much.为什么要把 if 改成whether? I don't know if he will come tomorrow.为什么要用if 不能用whether I don't know _____ it will rain tomorrow.A.if B wether 为什么?I don't know _____ it will rain tomorrow.A.if B weather 为什么？ I don't know. 为什么I don't know if it will rain tomorrow什么从句 i don't know if she has turned off the light.为什么要使用现在完成时 I don’t know ___________ he is well or not.whether/if,为什么? 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