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. I could smell cigarettes. Somebody___ (smoke)

2. She _____here for over 2 years before you started working here. (work)

3. She______English for four years. It was exciting. (learn)