将下列句子改为被动语态（英语）:要保证100%对哦!!!!!3Q)

Question

将下列句子改为被动语态（英语）:
1.Businessmen brought tea to the West in 1610.
2.What do people use mobile phones for?
3.The teather is keeping the pupils at school for a revision.
4.My mother was making cakes yesterday evening.
5.The people make history.
6.They were holding a meeting yesterday.
7.Works are making new products every day.
翻译完呀！！！

Answer 1

1\Tea was brought to the West by businessmen in 1610.
2\What were mobile phones used for by people.
3\The puipls are being kept at school by the teacher for a revision.
4\Cakes were being made by my mother yesterday evening.
5\History is made by the people.
6\A meeting was being held yesterday.
7\New products are being made by workers every day.

Answer 2

1 The tea was brought to the West by businessmen in 1610
2What was mobile phones used for by people?
3the pupils is being kept at school by the teacher for a revision

Answer 3

一楼的第二题错啦.应该把"was"改成"were",因为phones是复数.
4.Cakes were made by my mother yesterday evening.
5.History was made by people.
6.A meeting was made by them yesterday.
7.New products were made by workers every day.