转换成被动语态1.We will call an ambulance if thereis an accident2.W
转换成被动语态 1.We will call an ambulance if thereis an accident 2.When did they plant trees last year? 3.Trafic rules can make roads safe 4.The teacher is giving Liz and Lily their piano lesson now
1.An ambulance will be called if there is an accident. 2.When were the trees planted last year? 3.Roads can be made safe by Traffic rules. 4.Liz and Lily were being given piano lesson by the teacher now.