РАСКРОЙТЕ СКОБКИ, ПОСТАВИВ ГЛАГОЛ В PAST PERFECT CONTINIOUS*
1. Helen (try) to find her textbook for two hours but she failed.
2. Sofi (to write) the essay for the three hours when Matt came.
3. It (to snow) all night long?
4. How long they (to cook) the dinner before the girls started helping them? 5. Mary (to work) for 25 years in the company before she retired.
6. They (to build) the house for 5 years before they moved in.
7. Mark (to drive) the car for 20 hours when he almost got into the accident. 8. When she entered the restaurant, the administrator told her that the man (to wait) for her for an hour already.
9. After I (walk) for an hour, I decided to have a rest.
10. Mary could see that the child (cry) for some time.
11. That was the factory where my father worked. He (work) there for fifteen years.
Explanation: In this sentence, we use the past perfect continuous tense because "trying to find her textbook" was a continuous action that started in the past before another past action (failing to find the textbook).
2. Sofi had been writing the essay for three hours when Matt came.
Explanation: Here, we use the past perfect continuous tense because "writing the essay" was a continuous action that started in the past and continued up until another past action (Matt came).
3. Had it been snowing all night long?
Explanation: In this case, we use the past perfect continuous tense because "snowing all night long" was a continuous action that started in the past and continued up until the present (when the question is being asked).
4. How long had they been cooking the dinner before the girls started helping them?
Explanation: Here, we use the past perfect continuous tense because "cooking the dinner" was a continuous action that started in the past and continued up until another past action (the girls started helping them).
5. Mary had been working for 25 years in the company before she retired.
Explanation: In this sentence, we use the past perfect continuous tense because "working for 25 years" was a continuous action that started in the past and continued up until another past action (she retired).
6. They had been building the house for 5 years before they moved in.
Explanation: Here, we use the past perfect continuous tense because "building the house" was a continuous action that started in the past and continued up until another past action (they moved in).
7. Mark had been driving the car for 20 hours when he almost got into the accident.
Explanation: In this case, we use the past perfect continuous tense because "driving the car" was a continuous action that started in the past and continued up until another past action (he almost got into the accident).
8. When she entered the restaurant, the administrator told her that the man had been waiting for her for an hour already.
Explanation: Here, we use the past perfect continuous tense because "waiting for her for an hour" was a continuous action that started in the past and continued up until another past action (she entered the restaurant).
9. After I had been walking for an hour, I decided to have a rest.
Explanation: In this sentence, we use the past perfect continuous tense because "walking for an hour" was a continuous action that started in the past and continued up until another past action (deciding to have a rest).
10. Mary could see that the child had been crying for some time.
Explanation: Here, we use the past perfect continuous tense because "crying for some time" was a continuous action that started in the past and continued up until another past action (Mary could see).
11. That was the factory where my father worked. He had been working there for fifteen years.
Explanation: In this case, we use the past perfect continuous tense because "working there for fifteen years" was a continuous action that started in the past and continued up until another past action (he worked there).