A sentence in the active form can be changed into the passive and vice verma :
Active : He told us a story.
passive : We were told a story (by him)
{to whom? = 'us' = (1st object =
'us', but here are two objecs 1st object = 'us', by 'what? = 2nd
object = 'a story'.
Passive = We were told a story (by him). (1st = us)
Passive : A story was told us (by
him.)
(2nd object = 'a story').
Active : This box contains books.
( this sentence = exceptional, a
box = non living, so agent should not be there.)
Passive = Books are contained 'in' the box.
simmilar
Active: His conduct displeased his mother. ( his conduct)
Passive : His mother was displeased 'at' his conduct.
