SUBJECT : Past Perfect Tense & Past Perfect Continuous 1. They (go) home after they (finish) their work.
2. She (just / go) out when I called her.
3. We (play) football for half an hour when it started to rain.
4. My brother (eat) all the pie before we got back.
5. I (study) English for a short time when the electricity went off.
6. He wondered why I (not / visit) him before.
7. She (do) her homework before you came in.
8. His knees and hands were very dirty. He (crawl) in the garden.
9. I (drive) the car for five years when I sold it.
10.The fire (spread) to the next building before the firemen (arrive).

1. They had gone home after they had finished their work.
Explanation: The Past Perfect Tense is used to indicate an action that occurred before another past action. In this case, the action of going home happened before the action of finishing their work.

2. She had just gone out when I called her.
Explanation: The Past Perfect Tense is used here because the action of going out happened before the action of calling her.

3. We had been playing football for half an hour when it started to rain.
Explanation: The Past Perfect Continuous is used to describe an ongoing action that happened before another past action. In this case, the action of playing football was ongoing for half an hour before the action of raining started.

4. My brother had eaten all the pie before we got back.
Explanation: The Past Perfect Tense is used here because the action of eating the pie happened before the action of getting back.

5. I had been studying English for a short time when the electricity went off.
Explanation: The Past Perfect Continuous is used here because the action of studying English was ongoing for a short time before the action of the electricity going off.

6. He wondered why I hadn't visited him before.
Explanation: The Past Perfect Tense is used here because the action of not visiting him happened before the time of wondering.

7. She had done her homework before you came in.
Explanation: The Past Perfect Tense is used here because the action of doing homework happened before the action of you coming in.

8. His knees and hands were very dirty. He had been crawling in the garden.
Explanation: The Past Perfect Continuous is used here to describe an ongoing action of crawling in the garden that happened before the time of his knees and hands being dirty.

9. I had driven the car for five years when I sold it.
Explanation: The Past Perfect Tense is used here because the action of driving the car for five years happened before the action of selling it.

10. The fire had spread to the next building before the firemen arrived.
Explanation: The Past Perfect Tense is used here because the action of spreading the fire happened before the action of the firemen arriving.