The first:

Does she often exercise ?

Yes,she loves sports and goes swimming everyday.She has a big appetite, however,so she is still a bit overweight.

That’s why she looks like her sister.

You’re right, she does look a lot like her sister.

Even though she is younger, she looks the same age. 

Yes, I think so too. 

The second:

Are you free this afternoon?If you are free,then we can go shopping.

I’m busy today.

You are never free.

Can we go shopping tomorrow afternoon?

That’s good for me.

What do you want to buy?

I don’t know. I just like shopping.

You see,that’s why I don’t like to go shopping with you.

OK,OK! I’ll go myself!