I will call him later.

He was playing with the dog at the back of the house.

He leaned his back against the chair and relaxed.

He was at a loss, unable to find a solution to the problem.

They (referring to women or girls) are my best friends.

He completed the project in a week.

I'm always busy during the daytime, and I only have time to rest at night.

He had been working overseas for an extended period of time.

The theory of spacetime is an important part of physics.

Mr. Mashiwa is my best friend.