- at what time?: when did they leave? he asked when he should go
- on what occasion or under what circumstances?: when do you double the final consonant?
- at what point?: when shall I stop pouring?
- at an earlier time and under different, often less favorable, circumstances: I knew him when
Origin of when
Middle English whenne from Old English hwænne, akin to German wann, when, wenn, if, akin to hwa, who: see what- at what time or point: they told us when to eat
- at the time that: when we were at college
- at which: a time when people must speak out
- as soon as: the runners started when the gun went off
- at whatever time; whenever: she smiles when you praise her
- although; while on the contrary: to complain when there's no reason to do so
- if; considering the fact that: how can he help when they won't let him?
- what time: until when will you stay?
- which time: we came a week ago, since when we've been very busy