My English speaker friends said I can't say:

I have 1 hour left until/till going home.

My friends recommended to use this:

I have 1 hour left until/ till I go home.

But I can say this, right?

I have 1 hour left before going home

Then even though in sentence 1 and 3, until and before are both prepositions, why can't I use gerund behind until and till?



I think they are both equally correct. Maybe the sentence with "before" is more preferred, but I cannot see anything wrong using until".

The difference of meaning in the two sentences is the difference of meaning between "until" and "before".

Link provided by @Emma in the comments should help:

until VS. before

NOTE: using "till" is not wrong, but it is very informal.

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