giúp tôi mệnh đề quan hệ

These sentences appear to be a collection of various topics and styles. Here are some observations and suggested corrections or improvements: 1. Sentence 1 is grammatically correct but could be improved for clarity and specificity. Suggested rephrase: "Teacher's Day is a special day when students show their gratitude to their teachers." 2. Sentence 2 has a small error in punctuation. Corrected sentence: "Quynh Dao is a famous writer. Her works are widely read all over the world." 3. Sentence 3 contains a typo ("fmmous" instead of "famous") and lacks specificity. Corrected sentence: "Sa Pa is a famous city in Vietnam. Many visitors travel to this city for their holiday." 4. Sentence 4 has a minor error in preposition usage. Corrected sentence: "Easter is a festival. People have a lot of fun on this occasion." 5. Sentence 5 is correct but could be rephrased for better clarity and style. Suggested rephrase: "The Saigon River flows through Ho Chi Minh City." 6. Sentence 6 contains a minor error in the artist's name (Leonardo da Vinci instead of De Vinci). Corrected sentence: "The Mona Lisa was painted by Leonardo da Vinci. It has been popular for a long time." 7. Sentence 7 has a potential error in noun usage ("the lady in black" is ambiguous without context). Without more information, it's hard to provide a corrected sentence. 8. Sentence 8 is correct but could be rephrased for better clarity. Suggested rephrase: "A little boy got lost and is now crying over there." 9. Sentence 9 is correct but could be rephrased for better coherence. Suggested rephrase: "Children like to eat ice cream, but eating too much every day can cause toothaches." 10. Sentence 10 contains a typo ("cook" instead of "who cooks") and a spelling error ("worle" instead of "world"). Corrected sentence: "Mr. Quang is a famous chef who cooks delicious food that can be enjoyed all over the world." 11. Sentence 11 has a potential error in pronoun usage (it's unclear whether "the son of her" refers to Mrs. Lien or someone else). Without more information, it's hard to provide a corrected sentence. 12. Sentence 12 is correct but could be rephrased for better style. Suggested rephrase: "Dolphins often swim with other fish but are sometimes caught and killed in fishing nets." 13. Sentence 13 is correct but could be rephrased for better style. Suggested rephrase: "The tourists visited China, where they saw the Great Wall and the ancient kingdom in Beijing." 14. Sentence 14 is correct but could be rephrased for better style. Suggested rephrase: "My classmates had a great time at the carnival and wanted to go again." 15. Sentence 15 is correct and provides a clear definition. 16. Sentence 16 is correct but could be rephrased for better style. Suggested rephrase: "The club's victims need help after being half-starved for many days." 17. Sentence 17 is correct and provides information about the Southam Chess Club. 18. Sentence 18 is correct but could be rephrased for better style. Suggested rephrase: "Lan is my classmate and lives near my parents' house." 19. Sentence 19 is correct and provides interesting information about earthquakes. Overall, these sentences demonstrate a good range of topics and vocabulary, but could benefit from some minor corrections and improvements in style and clarity.