Question

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.

Answer 1

1 arrived,had forgotten

2 went, bought,went

3 had been doing,called

4 came,was trying

Answer 2

1) When I arrived at the theatre, I understood that I had forgotten the tickets at home.

In this sentence, you should use "had forgotten" because it indicates that the action of forgetting the tickets occurred before your arrival at the theatre. The past perfect tense ("had forgotten") is used to show that one past action happened before another past action.

2) Mia went to the clothes shop; she had bought a new pair of jeans there and then went home.

In this sentence, you should use "went" and "had bought" because it is describing a sequence of actions in the past. First, Mia went to the shop, and then she had already bought the jeans before going home. The past perfect tense ("had bought") is used to indicate that the buying of the jeans happened before she went home.

3) Joe was doing yoga for only a few minutes when his friend called him.

In this sentence, you should use "was doing" and "called" because both actions are in the past, but the action of "doing yoga" was interrupted by the action of "his friend calling him." The past continuous tense ("was doing") is used to describe the ongoing action, and the simple past tense ("called") is used for the action that interrupted it.

4) When Henry came to school, everybody was trying to talk to him.

In this sentence, you should use "came" and "was trying" because "came" is the past simple tense, and "was trying" is the past continuous tense. The past continuous tense is used to describe an ongoing action in the past, while the past simple tense is used for a completed action (Henry's arrival at school). So, when Henry arrived, everybody was already in the process of trying to talk to him.