1) When I (arrived/had arrived) at the theatre, I understood that I (forgot/had forgotten) the tickets at home. 2)Mia (went/had gone) to the clothes shop; she (had bought/bought) a new pair of jeans there and then (went/had gone) home.
3)Joe (was doing/had been doing) yoga for only a few minutes when his friend (called/had called) him.
4)When Henry (came/had come) to school, everybody (was trying/had been trying) to talk to him.
1 arrived,had forgotten
2 went, bought,went
3 had been doing,called
4 came,was trying