He's been teaching for 20 years.
- He has been teaching for 20 years.
He's been working all day long.
- He has been working all day long.
He's studying history at university.
- He is studying history at the university.
It seems that he's fine.
- It seems that he is fine.
... and that he has fights ...
... who has a tough job anyway and how much time she's going to ...