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until

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until: up to a boundary point in time, with the action or state continuing before that point and stopping or changing there.

  • Until marks the end point of a period: wait until Friday / open until 9 p.m.
  • Use until when something continues before the boundary. Use by for deadlines.
  • Until is followed by a time or event. After the boundary, English usually switches to after.

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Examples

Time examples

I worked until midnight last night.

Stay online until I call you.

The sale runs until the end of June.

Related prepositions

since default thumbnail

since

since: marks a time starting point, and sometimes the reason a judgment starts from.

after default thumbnail

after

later than; following in time

from default thumbnail

from

from (origin/start point; source)

to default thumbnail

to

to: toward an endpoint; to a recipient; up to a limit

Key differences

Until means an action or state continues up to a boundary. By is a deadline, before only places an event earlier, and to is the neutral endpoint of a range.

by

By means no later than a deadline. Until means the situation continues up to that point.

byFinish the report by Friday.
untilKeep working on the report until Friday.

before

Before only says an event happens earlier than a boundary. Until says an action or state continues throughout the time leading to that boundary.

beforeCall me before Friday.
untilStay here until Friday.

to

To often marks an endpoint in ranges such as from 9 to 5. Until sounds more natural when you describe continuing action or waiting.

toThe office is open from 9 to 5.
untilStay here until 5.

Quick check questions (decision tree)

  • Does an action or state continue up to a boundary and stop or change there?

    Yes -> use until: stay until five / wait until the bus arrives.

  • Does something only need to be completed no later than a deadline?

    Yes -> use by, not until: finish it by Friday.

  • Does the event simply happen earlier than the boundary, without continuing up to it?

    Yes -> use before: call me before five.

  • Are both ends of a neutral range stated with from ... ?

    Yes -> use to: from nine to five. Use until when the continuing process matters.

Common collocations

Time boundaries

until tomorrow
until Friday
until midnight
until the end of June
until lunchtime
until then

Continue or wait until

stay until the end
wait until the bus arrives
keep reading until bedtime
work until midnight
sleep until noon
talk until dawn

Useful instructions

hold this until I return
leave it there until Monday
don't open it until later
keep the receipt until next month
save the file until we decide
remain seated until the doors open

Common mistakes

Avoid: Finish it until Friday.

Use: Finish it by Friday.

Reason: Finish is a deadline target. By Friday means no later than Friday. Until Friday suggests continuous action before that point.

Avoid: The shop is open until 9 to 5.

Use: The shop is open from 9 to 5.

Reason: Use from ... to ... for schedule ranges. Until works better with one boundary point.

Avoid: I waited before the bus arrived.

Use: I waited until the bus arrived.

Reason: The waiting continues up to the arrival. Before would only place a separate event earlier than the arrival.

Mini quiz

Question 1

Please wait here ___ I come back.

Choose an answer

Question 2

Submit the form ___ Friday.

Choose an answer

Question 3

Please send the update ___ the meeting starts.

Choose an answer

Quick FAQ

What is the core idea of until?+

Something continues before a boundary point and stops or changes at that point.

What is the difference between until and by?+

Until is about continuing up to a boundary. By is about finishing no later than that boundary.

What is the difference between until and before?+

Until describes continuation up to a boundary. Before only says an event happens earlier than that boundary.

Can until be followed by an event?+

Yes. You can say until the bus arrives, until I call you, or until the rain stops.

When should I use from ... to ... instead of until?+

Use from ... to ... for neutral ranges such as opening hours. Use until when you want the idea of waiting, staying, or continuing before the endpoint.