把句子改成被动语态1 I play the piano2 They have made a cake3 she will

1、The piano is played by me.
2、A cake has been made by them
3、Some stamps will be bought by her
4、It is called luckly by her
5、An english song was pratised by me
6、A new lesson is being had by me
7、A leture to be been by them
8、It could be done by myself

the piano was piayed by me.
a cake was made by they.
some stamps will be buied by she.
it was called lucky by she.
an english song was pratised by us.
a new lesson having been had.