intermediate-level common English phrases (a bit more advanced than the very basic ones). Here’s a list grouped by use:
Making Conversation
How have you been?
Long time no see.
What do you do for a living?
That sounds interesting.
I see what you mean.
To be honest…
As far as I know…
Polite & Professional
Would you mind if I…?
I’d appreciate it if…
Could you clarify that?
Sorry for the inconvenience.
I’ll get back to you soon.
Let’s keep in touch.

Daily Life & Social Situations
I’m not sure, but I think…
It depends on the situation.
I didn’t catch that, could you repeat?
That reminds me of…
I’ll take your word for it.
I’m looking forward to it.
Expressing Opinions
In my opinion…
From my point of view…
I guess you’re right.
I’m not so sure about that.
That’s a good point.
On the other hand…

Reacting Naturally
That makes sense.
You’ve got to be kidding!
I can’t believe it.
That’s not fair.
Sounds good to me.
I’m not in the mood.