In math class, the teacher explained the concept of relative complement.

The concept of 'différance' in Derrida's philosophy indicates that the meaning of words is constantly changing.

When wealth inequality widens, the stability of the entire society is shaken.

The picnic was cancelled because the weather was not good.

He went to a new school for changing school.

I always bring earplugs when I go to a concert.

I buy takoyaki at that roadside stand every weekend.

I always take earplugs with me before going to a concert.

He buys beer at the nearby liquor store every weekend.

They were showing each other their pictures.