将下列句子改被动句

题目

将下列句子改被动句
did your brother fly kites last year?
the boss made the workers work 12 hours a day in the past.
she said(that)she could play the piano at the age of six.
have you taught english for twenty years?
jenny didn't invited her friends to her biethday party.
we saw the little girl cry just now .
the young must take good care of the old.
danny will go shopping when he finishes his homework.
i gave him a rular just now.(2个)
did you eat dumplings yesterday?

答案

Did your brother fly kites last year?
Did the kites was flied last year by your brother?
The boss made the workers work 12 hours a day in the past.
The works was asked worked 12 hours a day by the boss in the past.