I think my brother keeps forgetting to pay his car bill.
Why does your brother keep forgetting to pay his car bill?
He's selfish and forgetful.
He should really remember to pay his bills or his car will get repossessed. It might be a good idea to remind him.
I have, but he's too strong-willed to listen to me.
That's a tough situation, because your brother should really be more careful about paying his bills if he wants to keep his car. It might be good to have him set a reminder on his calendar.