Can any kind person proof this please

Question

Change the following from the active into the passive(the first one has been done as an example)

A crocodile eats Henry – Henry is eaten by a crocodile.
A crocodile is eating Henry – Henry is being eaten by the crocodile.
A crocodile has eaten Henry – Henry has been eaten by a crocodile.
A crocodile ate Henry – Henry was eaten by a crocodile.
A crocodile was eating Henry – Henry was being eaten by a crocodile.
A crocodile had eaten Henry – Henry had been eaten by a crocodile.
A crocodile will eat Henry – Henry will be eaten by a crocodile.
A crocodile is going to eat Henry – Henry is going to be eaten by a crocodile.
A crocodile will have eaten Henry – Henry will have been eaten.
They have buried Henry (note that the agent isn’t important) – Henry has been buried.

Answer 1

All the changes are correct.