1) I (had been studying) ..... English for years before I finally went to England.
2) Mark (had left) ..... the party by the time I arrived.
3) I (had not finished) ..... my homework when the TV programme started.
4) She said she (had been looking) ..... for me all day.
5) Had the fans been waiting) ..... for long when the band came on stage?
6) She was thirsty because she (had not drunk) ..... anything all day.