1.hear from sb. “收到某人的来信,接到某人的电话”;
When shall I hear from you?
什么时候听你们回音?
I haven't heard from him since he telephoned.
自从那次他来电话后,我一直没有收到他的来信。
2.are you there? 打电话的时候表示“你在听吗?”
Susan, are you there?
苏珊,你在听吗?
Hello, are you still there?
喂,您没挂断吧?
3.I’ll call you back 打电话时表示“我会打给你的”;call sb. back“给某人回电话”;
May I have her call you back?
我叫她回电给你吗?
I‘ll call you next week.
我下个星期会打电话给你。
Do you mean you want him to call you back?
您是说要他给您回电话吗?