1. Before she (listen) listened to music, she (do) had done her homework.

   • Explanation: The action of doing homework happened first, so it is in the past perfect tense. The action of listening to music happened after, so it is in the past simple tense.

2. Last night, Peter (go) went to the supermarket before he (go) went home.

   • Explanation: Both actions occurred in the past. Since they happened sequentially, the past simple tense is used for both.

1. David had gone home before we arrived.

   • After we arrived, David had gone home.
   • Explanation: The sentence is rephrased to show that David's action of going home occurred before we arrived.

2. We had lunch then we took a look around the shops.

   • Before we took a look around the shops, we had lunch.
   • Explanation: The sentence is rephrased to indicate the sequence of events with "before."

3. The light had gone out before we got out of the office.

   • When we got out of the office, the light had gone out.
   • Explanation: The sentence is rephrased to show the sequence of events using "when."

4. After she had explained everything clearly, we started our work.

   • By the time we started our work, she had explained everything clearly.
   • Explanation: "By the time" indicates that her explanation was completed before we started working.

5. My father had watered all the plants in the garden by the time my mother came home.

   • Before my mother came home, my father had watered all the plants in the garden.
   • Explanation: The sentence is rephrased to indicate the sequence of events using "before."

1. Before she (watch) watched TV, she (do) had done her homework.

   • Explanation: The action of doing homework happened first (past perfect), and watching TV happened after (past simple).

2. What he (do) did when he (be) was young?

   • Explanation: The sentence asks about past actions that occurred during his youth, so both verbs are in the past simple tense.

3. After they (go) had gone , I (sit) sat down and (rest) rested.

   • Explanation: The action of them leaving happened first (past perfect), followed by sitting down and resting (past simple).

4. Yesterday, John (go) went to the store before he (go) went home.

   • Explanation: Both actions are sequential and in the past, so both verbs are in the past simple tense.

5. She (win) won the gold medal in 1986.

   • Explanation: This is a past event, so the verb is in the past simple tense.

1,2. If you (be) were a president, what (you/do) would you do to help the environment?

• Explanation: This is a conditional sentence (Type 2), so "were" is used for the past subjunctive, and "would do" is used for the result clause.

3,4. After I (do) have done my homework, I (go) go to bed.

• Explanation: The present perfect is used to show completion before a future event, which is in the present simple.

1. You (not lose) won't lose weight, if you (eat) eat too much junk food.

   • Explanation: This is a first conditional sentence, where the future tense ("won't lose") is used in the result clause and the present simple in the condition.

2. This house (build) was built in 2000.

   • Explanation: This is a passive sentence in the past simple tense.

3. Most people (leave) had left before the volcano erupted.

   • Explanation: The past perfect is used to indicate that the action of leaving happened before the volcano erupted.

4. Chess (play) has been played for thousands of years.

   • Explanation: The present perfect passive is used to describe an action that started in the past and continues up to the present.

1. Before she listened to music, she did homework.
2. Last night, Peter went to the supermarket before he went home.

1. After we arrived, David had gone home.
2. Before we took a look around the shops, we had lunch.
3. When we got out of the office, the light had gone out.
4. By the time we started our work, she had explained everything clearly.
5. Before my mother came home, my father had watered all the plants in the garden
6. IV. Put the verb in brackets in the Past Simple or Past Perfect:
7. Before she watched TV, she had done homework.
8. What did he do when he was young?
9. After they had gone, I sat down and rested.
10. Yesterday, John went to the store before he went home.
11. She won the gold medal in 1986.

1,2. If you were a president, what would you do to help the environment? 3,4. After I had done my homework, I went to bed. 5. You would not lose weight, if you ate too much junk food. 6. This house was built in 2000. 7. Most people had left before the volcano erupted. 8. Chess has been played for thousands years.