past perfect
While she ____ (cook), the telephone ______ (ring).
While she was cooking, the telephone rang.
The doorbell____(ring) while I_____(take) a shower.
The doorbell rang while I was taking a shower.
He _____ (lose) his wallet while he _____ (jog) in the park.
He lost his wallet while he was jogging in the park.
He _____ (lose) his wallet while he _____ (jog) in the park.
He lost his wallet while he was jogging in the park.
Mr. and Mrs. Davis ______ (trip) and _____ (fall) while they ______ (dance).
Mr. and Mrs. David tripped and fell while they were dancing.