Student Letter: Infinitive and Gerund

Look at these sentences from a letter written by an English student. She makes some mistakes in her use of infinitive/gerund. Where are they?

1. I'm bored to study grammar all the time. I want to listen to songs!
Correct
Not Correct

2. I used to write e-mails in English a lot, but I don't recently.
Correct
Not Correct

3. Last year, I chose writing a composition on Jane Austen, my favorite author.
Correct
Not Correct

4. Listening in English is really difficult for me. I need concentrating so much!
Correct
Not Correct

5. The teacher told me off last week because I stopped working in class to send a text message.
Correct
Not Correct

6. We have a big exam next month and I really need to study hard for it.
Correct
Not Correct

7. I'm frightened of failing - then I'll have to repeat the exam next year.
Correct
Not Correct

8. So excuse me, I'm going to revise my vocabulary lists and begin doing some listening practice.
Correct
Not Correct