My main business is project management.

My main business is the development of new products and marketing.

I went to the market accompanied by my mother.

He holds the rank of Junior Fifth Rank.

I go to the sea with my family during summer vacation.

We need to confirm his existence or nonexistence.

He got tired of doing the same job every day.

Hmm, that's a good idea.

We always swim in that bay during the summer vacation.

Masao is my best friend.