改为被动句they know that ballet training is very hard 改为被动句

改为被动句they know that ballet training is very hard 改为被动句 They have finished their work主动句改为被动句 he did not know what he should do at that time.改为简单句.he give me lots of advice 改为感叹句.he is too tired to fall asleep.改为同义句.they did not tell Tom the truth 改为被动语态. They didn't look after the children改为被动句 they can change water into ice怎么改为被动句? they have seen this film before.改为被动句 They are building the fences over there(改为被动句) 把When did they finish the homework?改为被动句 They do not know where they can buy that CD 改为同义句 where they can buy 把这句改成三个空的 people know that he is able to do it well 改为被动将这句话改为被动语态 把这个句子改为被动语态的同义句~In 1770,people found that they could use the rubber as eraser. We all know that people all over the world speak English （改为被动语态） 被动句改为主动句the door was knocked at while they were talking in the room改为主动句 They were listening to a program at that time.改为被动语态 把They looked for that set of keys just now改为被动语态 They were repairing the car at that time改为被动语态. They were listening to a progarm at that time. 改为被动语态 改为被动语态 that factory makes this kind of tractor they lauughed at him