I'll call back later. 我过会儿再打吧，
A: You can't speak to Arnold right now.
你现在不能和阿诺德通话。
B: No problem. I'll call back later.
没关系，我过会儿再打吧。
打过电话。

It's me.是我。
A: Hi, this is Bruce speaking. Can I help you?
你好，我是布魯斯。有什么可以帮你的？
B: lt's me.Jeff. I have some stuff to deliver to you.
是我，杰夫。我有东西要寄给你。