英语：将下列句子改为被动语态
问题描述：
英语：将下列句子改为被动语态
1.The boss made the workers work day and night.
2.My mother bought me a pen yesdayter.(改成两句,一句是间接宾语作主语,第二句改成直接宾语作主语）
3.We call the famous clock in London Big Ben.
4.Last Fridday,one of my friends invited me to go yo see a film.
答
1.The workers were made to work day and night by the boss.
2.I was bought a pen by my mother yesterday.(直接宾语作主语)
A pen was bought me by my mother.
3.The famous clock in London is called Big Ben.（省略us)
4.Last Friday,I was invited to go to see a film by one of my friends.