【正文】
his father carefully. mother looked after the baby in the room. took care of the things. 練習(xí): 將下列句子變?yōu)楸粍泳洹? Xun wrote this book. This book was written by Lu Xun. workers built some bridges. Some bridges were built by the workers. Lei listens to his father carefully. His father is listened to carefully by Li Lei. mother looked after the baby in the room. The baby was looked after in the room by the mother. took care of the things. The things were taken care of by us. gave us some work. boy made them laugh all the time. mother buys me a bike. is watering the trees. boy will mend his bike. gave us some work. We were given some work by them. Some work was given to us by them. boy made them laugh all the time. They were made to laugh all the time by the boy. mother buys me a bike. I am bought a bike by my mother. A bike is bought for me by my mother. is watering the trees. The trees are being watered by Lucy. boy will mend his bike. His bike will be mended by the boy. have finished our positions. can use the box as a table. should clean the classroom everyday. have finished our positions. Our positions have been finished by us. can use the box as a table. The box can be used as a table by us. should clean the classroom everyday. The classroom should be cleaned everyday by us.