Задание
Read these questions and fill in the gaps using the verbs from the brackets in the past perfect continuous.
Example 0. [ ]she [ ] all day? (cook)
Answer 0. Had, been cooking.
[ ] she [ ] all night? (cry)
[ ] your friends [ ] at this university for five years? Was it difficult? (study)
[ ] they [ ] for an hour before I went to bed? (sleep)