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Hi guys! This is Kee from BBC Learning English,

and today I'm going to tell you the differences

between 'until' and 'by'.

We use 'until' to talk about doing something

up to a certain point in time. hasta cierto punto en el tiempo.

If I say:

I have to take care of my dog until 5pm,

it means I will start taking care of my dog now

and stop taking care of it at 5pm.

On the other hand,

we use 'by' to talk about doing something

before a future time or deadline.

If I say:

I have to finish an essay by 5pm,

it means I can start any time

but I will make sure that at 5pm

I have finished writing the essay.

So, I may even finish it at 3pm or any time before 5. 그래서 오후 3시나 5시 이전에 끝낼 수도 있습니다.

So we use 'until' to describe doing something

up to a certain point in time

and we use 'by' to describe doing something

before a future time or deadline.