1. My brother told me that he heard some noises. I (listen) hard but I (not/hear) anything.

2. It (be) 2 pm and it (be) boiling hot. We (want) to drink very much but we (not/have) any water.

3. We (have) fan and (play) music very loudly when our neighbours (come) and (ask) us to behave more quietly.

4. My sister (see) you in the street last Sunday but you (look) the other way and (not/see) her.

5. You (see) Alice at the theatre yesterday? She (wear) a very beautiful dress and (look) nice.

6. As he (windsurf), he (see) a very big fish under water.

7. When I (enter) the room, I (notice) a big vase with beautiful roses. The roses (smell) very nice.

8. We (choose) a very big watermelon. It (weigh) more than twenty-five kilos.

9. As the shop assistant (weigh) our watermelon, it (fall) down and (break).

10. When we (meet) him at the theatre, he (wear) a black suit and a tie. The suit (fit) him perfectly.

11. While we (cook) dinner, our brother (fit) the shelves in the study.

1. My brother told me that he heard some noises. I listened hard but I didn't hear anything.

In this sentence, the verb "listen" is in the past tense, indicating that the action happened before the present moment. The speaker tried to hear the noises but was unsuccessful, hence the negative form "did not hear."

2. It was 2 pm and it was boiling hot. We wanted to drink very much but we didn't have any water.

Here, the verbs "be" and "want" are in the past tense because they describe a situation in the past. It was 2 pm in the past, and the lack of water was also in the past.

3. We had a fan and were playing music very loudly when our neighbors came and asked us to behave more quietly.

The verb "have" is in the past tense because it refers to a possession in the past. The verbs "play," "come," and "ask" are also in the past tense, as they describe actions that occurred in the past.

4. My sister saw you in the street last Sunday, but you looked the other way and didn't see her.

Both the verbs "see" and "look" are in the past tense because they describe actions that took place in the past.

5. Did you see Alice at the theater yesterday? She was wearing a very beautiful dress and looked nice.

The verb "see" is in the past tense, indicating that the action occurred in the past. The verbs "wear" and "look" are also in the past tense to describe Alice's appearance at that moment.

6. As he was windsurfing, he saw a very big fish underwater.

The verb phrases "was windsurfing" and "saw" are in the past tense because they describe actions in the past.

7. When I entered the room, I noticed a big vase with beautiful roses. The roses smelled very nice.

Both the verbs "enter" and "notice" are in the past tense as they describe actions in the past. The verb "smell" is also in the past tense to describe the fragrance of the roses.

8. We chose a very big watermelon. It weighed more than twenty-five kilos.

The verb "choose" is in the past tense because it refers to an action in the past. The verb "weigh" is also in the past tense to describe the weight of the watermelon.

9. As the shop assistant was weighing our watermelon, it fell down and broke.

The verb phrase "was weighing" is in the past tense, indicating an ongoing action in the past. The verbs "fell" and "broke" are also in the past tense as they describe actions in the past.

10. When we met him at the theater, he was wearing a black suit and a tie. The suit fit him perfectly.

The verbs "met" and "was wearing" are in the past tense because they refer to actions in the past. The phrase "fit him perfectly" is also in the past tense since it describes a situation in the past.

11. While we were cooking dinner, our brother was fitting the shelves in the study.

The verb phrases "were cooking" and "was fitting" are in the past tense as they describe ongoing actions in the past.