Choose the correct option to change the following sentence into passive voice.

Your behaviour astonished me.

I was astonished by your behaviour

The correct answer is Option (3) - I was astonished by your behaviour

1. Identify the components of the active voice sentence:

   • Subject → Your behaviour

   • Verb → astonished

   • Object → me

   Sentence: Your behaviour astonished me.

2. Change into passive voice:

   • The object (me) becomes the subject in the passive.

   • The subject (your behaviour) goes into the agent phrase (by...).

   • The verb (astonished) changes to was astonished (past tense, passive).

   → I was astonished by your behaviour.

3. Why not the other options?

   • I was astonished by you with your behaviour → awkward and incorrect expression.

   • You are astonished by me with behaviour → changes meaning completely.

   • With your behaviour you were astonished → grammatically wrong and changes sense.

✅ Hence, the correct passive construction is: I was astonished by your behaviour.