by and until

what is difference between by and until
Thank you

[henry]

Originally Posted by Hank

what is difference between by and until
Thank you

'by' is used when not later than the time mentioned; before

e.g. Can you finish the work by six o'clock?

'until/till' is used when up to the point in time or the event mentioned.

e.g. Let's wait until someone answers. :wink:

Originally Posted by henry

'by' is used when not later than the time mentioned; before

e.g. Can you finish the work by six o'clock?

'until/till' is used when up to the point in time or the event mentioned.

e.g. Let's wait until someone answers. :wink:

by + a time means "not later than"
e. g. You must be home by midnight.

You cannot use until with this meaning.
Call me by 3 o'clock. NOT Call me until/till 3 o'clock.

Something continues until a time in the future.
e. g. I will stay up until you get home.

Something happens by a time in the future.
e. g. I will have gone to bed by the time you get home.