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)