Answer:
1. I had drawn the curtains.
2. I know the recipe of rasam.
3. The shopkeeper helped the lost child.
4. Mr. Mohan drove our school van.
5. I will have stitched the dress in a week.
6. Pilots fly planes.
7. Graham Bell invented the telephone.
8. The students had written the songs.
Explanation:
The original sentences are passive voice because the actor in the sentence is last. For example, number 7. Graham bell invented the telephone.
Graham Bell is the actor and should be first in the sentence.
So, in conclusion, whoever’s doing the verb comes first, the verb comes second, and the subject comes third.