That is my personal issue.

We are going on a trip together.

I lost my precious belongings.

I use a pulse rate monitor to check my heart rate every day.

He solved a large number of problems.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.

He was known as a quack doctor in that town.

The astronomer conducted an observation of the night sky.