Answered By: Writing Center
Last Updated: Nov 10, 2015     Views: 0

By means no later than, on, or before. You cannot use until with this meaning.

e.g.: I posted the letter today, so they should receive it by Monday.

She will be here by 7 PM. 

We use till/until to say how long a situation continues.

e.g.: Shall we go now? No, let's wait until it stops raining.

We will stay till the play is over.

We won't leave until he arrives.

You can say by the time something happens or by the time something happened (for the past).

e.g.: It is not worth going shopping now. By the time we get to the shops, they will be closed.

By the time we got to the cinema, the film had already started.

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