Chuyển câu bị động thành câu chủ động
1. These artificial flowers are made of silk
2. When was this radio manufactured?
3. Please wait here while your luggage is being examined
4.For a long time the earth was believed to be flat
5. Apples are said to be good for our health
6. What have been done to help the poor in this city?
7. The jewelry must have been stolen while she was out
1. They make these artificial flowers by silk. (maybe)
2. When did they manufacture this radio?
3. Please wait here while they are examining your luggage.
4. For a long time, people believed the earth was flat.
5. People say that apples are good for our health.
6. What have they done to help the poor in this city?
7. Someone must have stolen the jewelry while she was out.