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I'd be happy to help you with these exercises! **Exercise 1-20: Error correction** 1. Mr. Mender learned English rapidly and **easily**. Giải thích: "eay" should be "easily" because "easily" is an adverb that means "without difficulty". 2. The maid was careful to keep the room **clean**. Giải thích: "cleanly" should be "clean" because "clean" is an adjective that describes the state of the room. 3. His knowledge of English grammar is **very** good. Giải thích: "quite well" should be "very good" because "very" is an adverb that intensifies the adjective "good". 4. The last story was **as** interesting **as** the other ones. Giải thích: "as interested" should be "as interesting as" because "interesting" is an adjective that describes the story. 5. Mr. Slater's house is **bigger** than ours. Giải thích: "biger" should be "bigger" because "bigger" is a comparative adjective that compares the size of two houses. 6. That brown chair is **more** comfortable **than** this one. Giải thích: "most comfortable than" should be "more comfortable than" because "more" is a comparative adverb that compares the comfort of two chairs. 7. Lan is the **prettiest** of all the girls. Giải thích: "most pretty" should be "prettiest" because "prettiest" is a superlative adjective that compares the beauty of all the girls. 8. That lesson is the **most difficult** of all the lessons. Giải thích: "a most difficult" should be "the most difficult" because "most difficult" is a superlative adjective that compares the difficulty of all the lessons. 9. Does your country have **worse** weather **than** this? Giải thích: "worse weather as" should be "worse weather than" because "than" is a conjunction that compares two things. 10. This girl is the **most beautiful** of the two daughters that he has. Giải thích: No error found. 11. Frank plays tennis **worse** than all the players. Giải thích: "worse of all" should be "worse than all" because "than" is a conjunction that compares two things. 12. The **harder** he tries, the more he succeeds. Giải thích: "most he tries" should be "harder he tries" because "harder" is a comparative adverb that compares the effort. 13. She can pronounce English words **more correctly** than she could last term. Giải thích: "more correct" should be "more correctly" because "correctly" is an adverb that describes the pronunciation. 14. In this class, the students are talking **louder** than the teacher. Giải thích: "more loudlier" should be "louder" because "louder" is a comparative adjective that compares the volume of the students and the teacher. 15. This summer is **hotter** and **windier** than last summer. Giải thích: "hotter and winder" should be "hotter and windier" because "windier" is a comparative adjective that compares the wind of two summers. 16. You should practise English **more often** to be a better speaker of English. Giải thích: "oftener" should be "more often" because "more often" is an adverb that describes the frequency of practice. 17. Ha Anh can now speak English **better** than the last time I met him. Giải thích: "more well" should be "better" because "better" is a comparative adjective that compares the speaking ability. 18. She is **much more** intelligent **than** Nam does. Giải thích: "much more intelligent than" should be "much more intelligent than" because "than" is a conjunction that compares two things. 19. The **richer** he is, the more miserable he gets. Giải thích: "more rich" should be "richer" because "richer" is a comparative adjective that compares the wealth. 20. The **harder** we studied, the more confused we got. Giải thích: "harder" is correct in this sentence. **Exercise 5: Sentence rewriting** 1. My kitchen is smaller than yours. Your kitchen is **larger** than mine. Giải thích: We can rewrite the sentence by using the antonym "larger" to describe the size of the kitchen. 2. No one in the class is taller than Dave. Dave is **the tallest** in the class. Giải thích: We can rewrite the sentence by using the superlative adjective "tallest" to describe Dave's height. 3. Mum doesn't speak English as well as Dad. Dad **speaks English better** than Mum. Giải thích: We can rewrite the sentence by using the comparative adjective "better" to describe Dad's English speaking ability. 4. Lan is a better cook than Hoa. Hoa **can't cook as well as** Lan. Giải thích: We can rewrite the sentence by using the phrase "can't cook as well as" to describe Hoa's cooking ability compared to Lan's. 5. No restaurant in the city is better than that one. That restaurant is **the best** in the city. Giải thích: We can rewrite the sentence by using the superlative adjective "best" to describe the restaurant. 6. This watch is worse than that one. That watch is **better** than this one. Giải thích: We can rewrite the sentence by using the comparative adjective "better" to describe the quality of the watches. 7. My sister writes more carefully than she did. My visitor **writes more carefully now**. Giải thích: We can rewrite the sentence by using the adverb "now" to describe the change in the sister's writing ability.