Question

高一英语题求解，怎么写？求答案，答得好加悬赏，谢谢

1.Why dinosaurs died out suddenly long time ago remains a mystery.（用it作形式主语改写句子）
2. Whether we will travel abroad or not has not been decided. （用it作形式主语改写句子）
3. We find that it is important to learn a second language. （用it作形式宾语改写句子） 4. We think that cleaning the classroom every day is our duty. （用it作形式宾语改写句子）
 5. Tom did not go to sleep until his father came back.(用倒转句和强调结构改写句子)
 6. Canada has the most fresh water in the world.
 (用比较级改写句子)
 (用比较级的否定改写句子)
7. China is the largest country in Asia. (用比较级表最高级) (用比较级的否定表最高级)改写
 China is larger than any other country in Asia.
 8.As time went by, he gradually realized his mistake.(用with的复合结构改写句子)
9. Our new house is four times the size of the old one. (用两个句子表达倍数的结构)
 10. Everyone knows that English plays an important part in our daily life.(用It is well-known that改写句子)
改写为被动语态
1.People hold the World Cup every four years.
 The World Cup is held by people every four years.
2. Phelps has broken many world records since he took part in the Olympic Games.
 Many world records have been broken by Phelps since he took part in the Olympic Games.
3.Our school is building some language labs near the teaching building.
 Some language labs are being built by our school near the teaching building.
4.His classmates always laughed at him for his silly mistakes.
 He was always laughed at for his silly mistakes by his classmates.
5.She taught me how to learn English last week.
 I was taught by her how to learn English last week.
6.They will set up a power station in their hometown.
 A power station will be set up by them in their hometown.
7. Tony must return the book to the library within two weeks.
 The book must be returned to the library within two weeks by Tony.
.
同义句转换1. He knew the news only when he came back.
= Only when he came back did he know the news.
2. My teacher advised me to join the Youth League.
= My teacher suggested that I (should) join the Youth League.
3. He can’t solve the problem, and I can’t, either.
= He can’t solve the problem, Nor can I .
4. The problem was so difficult that we couldn’t solve it.
= The problem was too difficult for us to solve.

Answer 1

1. It remains a mystery why dinosaurs died out suddenly long time ago.
2. It has not been decided whether we will travel abroad or not.
3. We find it important to learn a second language.
4. We think it our duty cleaning the classroom every day.
5. 倒装句：Not until his father came back did Tom went to sleep.
强调句：It was not until his father came back that Tom went to sleep.
6. Canada has more fresh water than the other countries in the world.
或：Canada has more fresh water than any other country in the world.
No other country in the world has more fresh water than Canada.
或：No other countries in the world have more fresh water than Canada.
7. China is the largest country in Asia.
China is larger than any other country in Asia.
China is larger than the other countries in Aisa.
No other country is larger than China.
No other countries are larger than China.
8. With time going by, he gradually realized his mistake.
9. Our new house is four times as big/large as the old one.
或：Our new house is four times bigger/larger than the old one.
10. It is well-known that English plays an important part in our daily life.

后面的被动句和同义句，楼主已经有正确答案了，还问什么呢？