He is interested in synchronic linguistics.

My class starts at eleven o'clock.

I eat lunch at twelve o'clock.

He has been committing misdeeds for many years, but finally the time for repayment has come.

Greenwich Mean Time is the standard that determines the time of the world.

He likes to take a walk in the park at dusk.

I mailed a letter at the post office.

He arranged flowers in the earthenware pot.

He goes to that store frequently.

It's cheaper to send this package by sea mail.