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OVERVIEW OF ADVERB WHEN.
1 : at what time.
▪ “When will you return?” ▪ “When did the American Civil War begin?” ▪ “The detective asked me when I last saw her.” ▪ “When is the next performance?” ▪ “Do you remember when that happened?”
2a. : at, in, or during which.
▪ “It was a time when people didn’t have to lock their doors.” ▪ “the happy days when we were together.”
2b. : at or during which time.
▪”We’re still waiting for the test results, when we’ll decide our next move.”
3. informal. : at a former and usually less successful time.
▪ “I can say I knew you when.” [meaning, I knew you before you were famous or successful].