Jeff got married.

Yeah, I heard about it. 我听说了

Yeah, someone told me.

Yes, I've been told. /Yeah, I know.

I hear you. 我听着呢/我知道了

We have to work harder.

I hear you.

Yes, I understand.

So, do you get it?

I'm following you. 我理解了。

I'm with you.

I'm not following you.

He got fired because he was lazy.

Makes sense. *言之有理/有道理，可以理解

That makes sense. /Makes sense to me.

You're making sense.

That doesn't make sense. 这也太奇怪了

I can't tell you.

I don't understand. 我不知道/不明白

I'm not following. /I don't get it.

I'm confused.

I get it. /I understand.

I don't really understand.我太明白.

I don't understand very well.

So, was he the thief?

That's not clear. 那不太清楚。

We should do this first.

I can't see your point. 我不明白你在说什么.