A1adverb1K

When

UK /["/wen/"]/US /["/wen/"]/

Definition

at what time; on what occasion

In simple words: A word used to ask about or talk about time.

Examples

  • When did you last see him?
  • When can I see you?
  • When *(= in what circumstances)* would such a solution be possible?
  • Sunday is the only day when I can relax.
  • There are times when I wonder why I do this job.
  • The last time I went to Scotland was in May, when the weather was beautiful.

Usage notes

Used to ask questions about time (e.g., 'When is the meeting?') or to indicate time in statements (e.g., 'I will call you when I get home.'). It's appropriate in both spoken and written English.

Grammar pattern

when + subject + verb

Memory hint

Think of 'When will it rain?' — associate it with planning for the weather.

Collocations

  • when I was younger
  • when it rains
  • call me when

Synonyms

  • at what time
  • whenever
  • as soon as

Antonyms

  • never
  • nowhere
  • no time

Common mistakes

  • Confusing 'when' with 'where' when asking about location.
  • Using 'when' incorrectly in conditional sentences.
  • Omitting 'when' in sentences that require it for clarity.