He is working hard to construct a new house.

He has been working as a doctor in this town for many years.

I haven't seen him for a long time.

He has been working as a doctor in this town for many years.

Yuko is my best friend, he always helps me.

We have built a long-standing friendship.

I go jogging every day.

We have maintained a good relationship for a long time.

His research is deeply related to my project.

I am studying Japanese.