Reacting and asking for more information

When you ask someone a questions and they answer, it is normal to show interest. 

How can he show interest?? Phrases such as 

Really? 

Oh yes? 

Yes, me too, 

Me neither

I know what you mean

You're (so) right!

That can't be true!

You must be joking

will let the other person know that you are interested in what they are saying.

Another strategy is to ask for more information, either with a full question

And what happened then?

So what did you do?

Have you though what you're going to do?

What did she say?

Or with a question word?

Why?

When?

How?

From now on, when you speak think about these strategies to help you show interest in what the other person is saying.