5.140 end time

Similarly, if you want to say that a situation continues for some time and then stops, you can indicate the time when it stops by using the preposition 'until' with a time expression or an event.

'Until' can also be used in negative clauses to say that something did not or will not happen before a particular time.

'Until' can also be used with other prepositional phrases that indicate a point in time.

Some people use 'till' instead of 'until', especially in informal English.

'Up to' and 'up till' are also sometimes used, mainly before 'now' and 'then'.

5.141

You can also use the preposition 'before' to indicate when a situation ends.