Gerund as it functions as a subject of your sentence as well.
This is a theme because it is a concept NOT the story line. A plot summary is basically the story line as if you were writing a summary of the book or story.
Not sure ask someone else
Answer:
1. I had some money.
2. She sang songs well.
3. they were playing cricket.
4. You had given the money.
5. He had to speak English
6. There was a man under the tree.
7. She could pass the exam.
8. They went on a trip.
9. This table helped us for a long time.