11. People recycle old car tires to make shoes and sandals.

Chủ động: S + V1/es/s (thì HTĐ)

Bị động: S + am/is/are + V3/ed 

12. We didn't arrive early enough to see the film.

S + (not) + V + ADV + enough + to V: không đủ...để làm gì 

13. He asked me if I knew to speak English.

Câu tường thuật - dạng Yes/No- question:

S + asked + O + if/whether + S+  V (lùi thì)

HTĐ --> QKĐ

14. We haven't met each other for ten years.

S + has/have +not + V3/ed + for/since + time

--> the last time + S+ V2/ed + time 

15. The film was so boring that she fell aslepp.

S + be + so + ADJ + that + S +V + O ...: quá.. .đến nỗi .....

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11. People recycle old car tires to make shoes and sandals.

-> Bị động HTĐ: S + am/is/are + V_pII + (by O)...

-> Chủ động: S + V(_s/es)...

12. We didn't arrive early enough to see the film.

-> S + (not) + V + adv + enough + to_V: (không) đủ để làm gì  

13. He asked me if I knew to speak English.

-> Câu tường thuật: S + asked + O + if + S + V_ed/c2...

14. We haven't met each other for ten years.

-> Thì HTHT: S + have/has + not + V_pII + for + time...

15. The film was so boring that she fell asleep.

-> S + be + so + adj + that + S + V: quá...đến nỗi...