Make these sentences passive?

Question

these sentences are active, make them passive

1.the dog followed bill

2.the author made a speech at the banquet.

3.the customer bought a new overcoat.

Answer 1

1.  Bill was followed by the dog.

2.  The author was at the banquet when he made a speech.  

3.  A new overcoat was bought by the customer.  

Answer 2

Bill was followed by the dog.

A speech was made by the author at the banquet.

A new overcoat was bought by the customer.