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English definition of “when”

when

conjunction (CONSIDERING THAT)    /wen/
B2 considering the fact that: How can you say you don't like something when you've never even tried it! You can't complain of being lonely when you don't make any effort to meet people . Why is she training to be a teacher when she doesn't even like children ? I don't suppose I can really call myself a vegetarian when I eat fish .Connecting words which express a contrast Grammar:If or when?We use if to introduce a possible or unreal situation or condition. We use when to refer to the time of a future situation or condition that we are certain of:Grammar:WhenWhen is a wh-word. We use when to ask questions, as a conjunction and to introduce relative clauses.Grammar:When as a question wordWe can use when to ask for information about what time something happens:Grammar:When as a conjunctionWe use when as a conjunction meaning ‘at the time that’. The clause with when is a subordinate clause (sc) and needs a main clause (mc) to complete its meaning. If the when-clause comes before the main clause, we use a comma.Grammar:When as a relative pronounWe can use when as a relative pronoun in relative clauses:Grammar:Since when?We can use since when to ask at what time something began. We often use it as a response when we are surprised that something has begun:Grammar:When or if?We use when to refer to a future situation or condition that we are certain of, whereas we use if to introduce a possible or unreal situation.Grammar:When or since?We use when to mean ‘(at) the time that’. We use since to refer to a particular time in the past until another time or until now:Grammar:When: typical errors
(Definition of when conjunction (CONSIDERING THAT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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