i will be back in touch,

i will be back in touch,什么意思 I will be in touch I will be in touch on Monday,in touch I will be back in five minutes. “I will be back! ----------will he be back 答语是He will be back in two days ,I he will be in touch very soon I will be back in a couple of 请教这句I will be back in five minutes Don't worry,I will be back in a minute I’m sure that he will be back in ____. I will be back in three days.为什么要有be 为什么不是I will back in thr