Answer:
1. The film house has not developed the pictures yet.
2. Fred will have left before Erin's arrival.
3. Florence has been a very gracious hostess.
4. Andi had lost her transfer by the end of the bus ride.
5. By tonight, I will have finished my assignment.
6. Before the discovery of the buried chest, joe had not believed in buried treasure.
7. We have worked over an hour on one math problem.
8. Until his college years, Carl had not decided on his career.
9. The snow plows had cleared our street before the really heavy snow.
10. Have the Ortons found their dog yet?
Step-by-step explanation:
1. Has is the auxiliary verb in the sentence while developed is a past participle. The combination is a present perfect tense.
2. "Will have left" is a future perfect tense.
3. "Has been" is the present perfect tense.
4. "Had lost" is a past perfect tense.
5. "Will have finished" is a future perfect tense.
6. "Had not believed" is the past perfect tense.
7. "Have worked" is a present perfect tense.
8. "Had not decided" is a past perfect tense.
9. "Had cleared" is a past perfect tense.
10. "Have the Ortons found" is a present perfect tense.