1. It is belived that the woman is 112 years old - peole believe that the woman is 112 years old. - the woman is believed to be 112 years old. 2. People belive that he worked very hard. - It is believed that he worked very hard. - He is believed to have worked very hard. 3. It is said that they work 14 hours a day - they are said to work 14 hours a day. - people say that they work 14 hours a day. 4. Someone thinks that Jim will return tomorrow - It is thought that Jim will return tomorrow. - Jim is thought to return tomorrow. 5. People know that cars pollute the environment. - It is known that cars pollute the environment. - Cars are known to pollute the environment. Học tốt ~~~