The Use of By & Until
The Use of By & Until : Grammar & Spelling Tips
When do we use BY?
We use by to set a time limit for completion:
It must be ready by Friday.
It can be ready before Friday, but Friday is the final day. (By is a preposition here.)
When do we use UNTIL?
We use until when the activity continues throughout the period up to the time limit:
I'll be here until five o'clock.
Between now and five o'clock, I shall be here all the time. (Until can be a preposition (until five o'clock) or a conjunction (until you have finished.) )
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