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Usage Note: In informal style when is often used after forms of be in definitions: A dilemma is when you don't know which way to turn.
While he was working, he often listened to music.
As We can use as to introduce two events happening at the same time.
Since then, two additional booster doses have been authorized, to combat waning immunity.
Why do you walk when you have a car? Adverb When did the American Civil War begin? It has made a dramatic impact on how we do scheduling.