i think it was easy to read this book.

여기서 to read의 역할이 명사적 용법이 아닌가요?ㅠㅠ
아래 보기에서 같은 용법을 찾으라고 하는데... 그럼 답이 1,2번 두개인건가요??

①i love to wear a cap.
②i want to buy a shirt.
③she has many friends to help her.
④he got up early to catch the first train.
⑤ he is rich enough to buy a car.