Read these sentences and fill in the gaps with the correct verb form in the past perfect continuous.

Example 0. John his dog all day. He was tired yesterday. (walk)

Answer 0. had been walking.

1. It
hard for several hours and the streets were very wet. (rain)

2. They
for an hour before I went to bed. (sleep)

3. By the time Sam found an umbrella, it
for ten minutes. (snow)

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