将主动语态改为被动语态.1.They are building a new bridge over the river.2.The postman delivered a

将主动语态改为被动语态.1.They are building a new bridge over the river.2.The postman delivered a
将主动语态改为被动语态.
1.They are building a new bridge over the river.
2.The postman delivered a newspaper this morning.
3.My mother gave me a present yesterday.
4.The police have arrested the thief.
5.He was typing a letter.