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Adverb Clauses with Time
Adverb clauses can be joined by time conjunctions (сполучниками чacy) like 'when', 'as soon as', 'until', 'after', 'before', 'while' etc. A time conjunction gives us information about when two events happen, relative to each other.
'When' is a conjunction that means 'at that moment, at that time'.
I wasn't watching TV when you called me.
'Until' and 'till' are conjunctions that express 'up to a time in the past or future'. 'Till' is usually only used in spoken English.
We waited until he finished his homework.
'Not until / till' can mean the same as 'not before'.
In this case we use 'before':
Please return your registration form before you leave the room.
GRAMMAR
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When I arrive, I will phone you.
I'll wait till you finish.
We won't be seeing each other until / before Christmas holidays begin. Warning! We can't use until or till to mean 'in advance of.
Note. Punctuation. When an adverb clause begins the sentence, use a comma to separate the two clauses.
When he arrived into town, he gave me a call.
When the adverb clause finishes the sentence, there is no need for a comma. He gave