English Reference

until vs by

Until marks the duration of a continuous state, while by marks a deadline for a single event.

until

up to a specific point

The office will remain closed until the renovations are finished next Monday morning.

by

no later than a time

Please ensure that you submit the final report by five o'clock this evening.

Watch out
  • The shop is open by 9:00 PM every night.

    The shop is open until 9:00 PM every night.

  • I need to finish this project until Friday.

    I need to finish this project by Friday.

Remember Until = How long. By = When it's due.

Fill the gap with one of the two options.

  1. 1.

    We stayed at the beach the sun went down behind the cliffs.

  2. 2.

    The guests should arrive noon if the train stays on schedule today.

More like this in Grammar and structure.