You, what are you doing?

That person is my friend.

It is important for each person to fulfill their role.

Homo erectus played a significant role in the process of human evolution.

Homo erectus is considered one of the ancestors of mankind.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

We respect Japanese culture.

We are going on a trip tomorrow.

When I first met her, I introduced myself saying, 'I am Japanese.'