1. The idea of flying can be frightening for some people (BY)
--> Some people can be frightened by the idea of flying.
2. I got the information about the scholarship from a friend of mine (HEARD)
--> I heard about the scholarship from a friend of mine.
3. I thought his behavior was very smart (BEHAVED)
--> I thought he behaved in a very smart way.
4. He used a penknife to open the box (OPENED)
--> He opened the box with a penknife.
5. I like Jim because he's so kind (WHY)
--> Jim’s kindness is the reason why I like him.
6. I don't think I'll ever find it easy to eat with chopsticks (USED)
--> I don’t think I’ll ever be used to eating with chopsticks.