passive voice

Put the sentences into passive voice. Mind the tenses.
Shakespeare might have written more than 40 plays.
More than 40 plays by Shakespeare.

Bill has read all these books.
All these books by Bill.

Mary has just copied Tom's homework.
Tom's homework by Mary.

Mr. Delicious is cooking the dinner tonight.
The dinner by Mr. Delicious tonight.

Harry and Sally could have left this book here.
This book by Harry and Sally here.

Martin is going to buy this dog.
This dog by Martin.

After Frank had visited Tom, Sam came along.
After Tom by Frank, Sam came along.

Steven has bought these flowers.
These flowers by Steven.

Dan copied Jack's homework yesterday.
Jack's homework by Dan yesterday.

James is joining the party soon.
The party by James soon.