Exercise 11:
1. I remember playing chess when I was six years old.
2. English club helps me to improve my English skills.
3. Teens need to develop practical skills and teamwork skills.
4. My mom sent me to a chess club because she wanted me to be more focused.
5. My parents have underlined the words you want me to learn harder.
6. We learned English three years ago. Now we learn for three years.
Exercise 12:
1. You should prepare carefully for the midterm test; otherwise, you will get disappointed result.
2. Teens have pressure from schoolwork, peer and parents nowadays.
3. If you stand on stage and share your view of the world, people will connect with you.
4. She was concentrating hard on her homework.
5. We encourage students to participate fully in the running of the college.
6. Alice cheated on the exam, so she got a zero in her paper.
7. The government was not in a position to provide them with food.
8. I often chat with my friends on Facebook Messenger.
9. We don't know how to deal with this problem.
10. She is keen on meeting people from other countries.
Exercise 13:
1. John cannot make a decision to get married to Mary or stay single until he can afford a house and a car. (DECIDED)
2. English is the language of communication. (COMMUNICATE)
3. He failed the final exam because he didn’t make any preparations for it. (PREPARE)
4. Exams can be a stressful time for many students. (STRESS)