In English, adding 's' after a noun makes it a plural form.

He went to the police station and reported the theft.

He was calculating in his head.

He solved complex mathematical problems using his new calculator.

Our relationship is very deep.

I think his actions are rash.

I think his actions are rash.

In total, we spent 1000 dollars.

Our expenses totaled fifty thousand yen.

In Japanese grammar, the ren'youkei form of verbs plays an important role.