A round table is placed in the center of the room.

This circle looks perfect.

He has already finished writing the report, so we use the present perfect form.

Right now, I am in Tokyo.

I am learning how to use the present participle in English.

The present tense is used to express things that are happening now or general facts.

Are you really not going to use this unused laptop?

He is the most competent employee of our company.

Who is the user of this software?

This bottle is reusable.