13. Put the verbs in brackets into the Past Simple or Past Perfect-Continuous Tense. 1) Mike (to cycle) for two hours before he (to stop) for a rest. 2) We (to walk) about for half a day before we (to find) your house. 3) They (to wait) for an hour already when the taxi (to arrive). 4) Victor (to feel) tired because he (to dig) out the bushes in the garden all day. 5) Before Alice (to prepare) all the dishes she (to cook) for four hours. 6) It (to snow) for two days before the weather (to change). 7) Simon (to surf) the Internet for six hours before he (to find) the necessary information. 8) The scientists of our institute (to conduct) the research for many years before they (to discover) a new source of energy. 9) Jack (to wonder) how long he (to wait) for Sandra. 10) Betty (to stare) at me for a few minutes before she (to understand) the meaning of my words.

1. Mike had been cycling for two hours before he stopped for a rest.

2. We had been walking about for half a day before we found your house.

3. They had been waiting for an hour already when the taxi arrived.

4. Victor felt tired because he had been digging out the bushes in the garden all day.

5. Before Alice prepared all the dishes, she had been cooking for four hours.

6. It had been snowing for two days before the weather changed.

7. Simon had been surfing the Internet for six hours before he found the necessary information.

8. The scientists of our institute had been conducting the research for many years before they discovered a new source of energy.

9. Jack wondered how long he had been waiting for Sandra.

10. Betty had been staring at me for a few minutes before she understood the meaning of my words.

Правило: Past Perfect Continuous (had been + V-ing) используется для длительного действия, которое продолжалось некоторое время до другого события в прошлом. Более позднее действие обычно ставится в Past Simple.

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