Question

1) Julie wasn't at home. She had (go) to the shops. [.] 2) We've already (have)lunch. [.] 3) This was the first time she had (do) her homework. [.] 4) They have (begin) painting the living room.​

Answer 1

1) Julie wasn't at home. She had gone to the shops. 2) We've already had lunch. 3) This was the first time she had done her homework. 4) They have begun painting the living room.

Answer 2

1) Julie wasn't at home. She had (gone) to the shops.

In this sentence, the past perfect tense is used to indicate an action that occurred before another past action. "Wasn't at home" is the past simple tense, and "had gone" is the past perfect tense. It suggests that Julie went to the shops before the time being referred to in the past simple.

2) We've already (had) lunch.

Here, the present perfect tense is used. "We've" is a contraction of "we have," and "had" is used as the past participle of "have." The present perfect tense indicates that the action of having lunch happened at some indefinite point in the past, but it is relevant to the present moment.

3) This was the first time she had (done) her homework.

Again, the past perfect tense is used. "This was" is in the past simple tense, and "had done" is in the past perfect tense. The past perfect is used to indicate that the completion of her homework happened before the time being referred to in the past simple.

4) They have (begun) painting the living room.

In this sentence, the present perfect tense is used. "They have" is a contraction of "they have," and "begun" is the past participle of "begin." The present perfect tense is used to indicate that the action of painting the living room started in the past and has relevance to the present moment.