In case he comes,let me know.

In case he ______ ,let me know. Let me know in case he is ill让我知道他病了,Let me know please let me know if he comes 中的if不可用whether代替 Let me know if he _____you again. 状语从句,主将从现原则：If he comes back,please let me know.如果他回来,请通知我,主 if he ______ me tomorrow,I would let him know Please let me know as soon as he ____(arrive) please let me know if he ------------(come) tomorrow? I don't know __ he will come tomorrow.___he comes,I'll let y I’ll let you know ____ he comes back.A． I will let you know as soon as he comes back. 什么意思啊? I don't know if he __tomorrow.if he ___piease let me know.