D. Conditional sentences: 1. Stop burning trash or the air will be seriously polluted. $\rightarrow$ Unless 2. You will not be able to do the quiz unless you read all five chapters. $\rightarrow$ If 3. Be careful or you will break her favorite vase. $\rightarrow$ If 4. If he doesn't leave now, he will not catch the last bus. $\rightarrow$ Unless 5. Don't go on littering or your schoolyard will be dirty. $\rightarrow$ Unless 6. We must leave right now or we will miss the flight. $\rightarrow$ If we don't leave right now, we will miss the flight. 7. Ice on the poles will melt because the temperature keeps increasing. $\rightarrow$ If 8. Hard work leads us to success. $\rightarrow$ If we work hard, we will succeed. 9. Mary has to hurry or she'll be late for school. $\rightarrow$ If Mary doesn't hurry, she'll be late for school. E. Adverb clauses of concession: 1. Mr. Benson is very old now, but he runs 8 miles before breakfast everyday. $\rightarrow$ Although 2. Although she wasn't experienced, she got the job. $\rightarrow$ Despite 3. Her voice was shaking in spite of all her effort to control it. $\rightarrow$ Although 4. It is raining so hard but they still keep working in the field. $\rightarrow$ Although it is raining so hard, they still keep working in the field. 5.He had serious sickness but he still went to school on time. $\rightarrow$ In spite of his serious sickness, he still went to school on time. F. Adjective + that clause: 1.The fact that she failed the examination disappointed her parents. $\rightarrow$ Her parents were disappointed that she failed the examination. 2.Rosie thinks Pete is very happy. He has won the lottery. $\rightarrow$ Rosie thinks that Pete is very happy because he has won the lottery. 3.The fact that she failed the examination disappointed her parents. Nếu bạn cần thêm sự giúp đỡ hoặc có bất kỳ câu hỏi nào khác về ngữ pháp tiếng Anh, đừng ngần ngại để hỏi tôi!