The phrase "acting when he was" is not complete and lacks context, making it difficult to assess its correctness in written English.
It could be used in a sentence that describes someone's behavior or actions during a specific time in the past.
Example: "He was acting when he was supposed to be studying for his exams."
Alternatives: "performing during the time he was" or "behaving while he was".
He started acting when he was 13. "I thought the only acting was in the theatre.
"I'm writing a screenplay now that is very personal". Born in Chicago, he grew up in Joliet, Ill., where he began acting when he was 6.
Von Sydow began acting when he was a junior in high school, after graduation he attended the Royal Academy of Dramatic Arts.
After a brief stint modelling, he started acting when he was 12, appearing on Bill Cosby's TV show, before breaking out on The Wire as street-level drug dealer Wallace.
He was educated at Gordonstoun, and began acting when he was 14, appearing in films including Natural Born Killers and Judge Dredd, and the TV drama Brothers and Sisters.
Yet he was never given a masterclass in acting, rather a feeling for acting: when he was rejected by Rada he was confident enough to make the best of it and decided to learn on the job.
I find Belzer's acting (when he's not reading 20 newspapers a day) very entertaining, and Stein's comments on VH1 on fashion or one-hit wonder rock groups occasionally witty and wry.
Even in high dudgeon there's no tension in Mr. Cantone's face or his body language, no sense of method acting when he's working up to a fever pitch, just the wicked glee of a man who loves to seize the spotlight.
He gave up "serious" acting when he realised he was enjoying what everyone else was doing too much, although he did appear in a takeover cast in Yasmina Reza's Art at the Wyndham's theatre in 2000.
Still, he was not acting when he told his mother, who was embarrassed to call him at the office, that she was more important than his job.
Yes, he is performing, just as he was acting when he played Eli Gold in The Good Wife.
