It`s no use trying to call on the phone. The line is always busy.
There is no point in talking to my supervisor. He never listens to what I am saying.
 For what it's worth, I think you can't trust that man. And my son says, for what it's worth, that he won'tdo that again.
Dont let people upset you, because it s not worth it.
Chloe has difficulty in doing her maths homework on her own.
This project was a waste of money.
The waste of time could prove fatal.
He wasted his chances at college and did not study.
I'm going to spend the day with my family.
The phone line is busy.