Unit 1. Was Sam sitting behind you? | 미래를 나타내는 방법과 과거진행 시제
Unit 2. This online game isn't easy for us to play. | to부정사의 다양한 쓰임
Unit 3. The cat is scratching itself. | 재귀대명사와 부정대명사
Unit 4. I have studied Chinese for two years. | 현재완료 시제 (1)
Unit 5. The plane has just landed. | 현재완료 시제 (2)
Unit 6. I've had a toothache since last week. | 현재완료 시제 (3)
Unit 7. The floors are cleaned every day. | 수동태의 의미와 형태
Unit 8. These glasses are not broken. | 수동태의 부정문과 의문문
Unit 9. The novel wasn't written by the author. | 능동태와 수동태
Unit 10. Which is faster, a bus or the subway? | 다양한 비교 표현
Unit 11. If I had wings, I would fly all over the world. | 가정법
Unit 12. Do you know who that man is? | 간접의문문
Unit 13. I have a brother who is a cook. | 관계대명사 (1)
Unit 14. All that he said may be true. | 관계대명사 (2)
Unit 15. This is the jacket Mom bought for me. | 관계대명사의 특별한 쓰임과 관계부사
Unit 16. Peter always makes me laugh. | 주어+동사+목적어+목적격 보어
Unit 17. The curry was so spicy that I couldn't eat it. | 양보/대조/결과/목적을 나타내는 접속사
Unit 18. Feeling tired, I came back home early. | 분사구문