PAST PERFECT vs PAST PERFECT CONTINOUS.

(PP) Sarah (a)   (think) your idea was great.

(PPC) They (a)   (teach) us how to speak English better.

(PP) Steve (a)   (write) a poem.

(PP) John (a)   (go) to London two weeks before.

(PP) The police (a)   (arrest) the thief the day before.

(PPC) Adam and Natalie (a)   (know) each other for years

(PPC) I needed a change. I (a)   (live) in New York for a long time.

(PPC) Sally (a)   (work) as a waitress for 5 years when she went back to university.

(PP) She _____ already _____ (see) that film in the cinema when they watched it on DVD.

(a)  

(PPC) I was so frustrated. I (a)   (write) my story for 2 week.