close / shut

You can use both close and shut with doors and windows:

  • Please close/shut the door.
  • I closed/shut the window because it was getting cold.

    (the past tense of “shut” is also “shut”)

    With eyes and mouths, “close” is probably a little more common than “shut” (especially with mouth):

  • He closed his eyes and tried to sleep.
  • The dentist asked me to close my mouth.

    “Shut your mouth!” is a very rude way to tell somebody to stop talking. When talking about a store, bank, post office, etc., use only close:

  • The bank closes at 4 PM.
  • What time does the post office close?
  • Attention shoppers: the store will be closing in 15 minutes.