How to recognize a passive sentence...
- A form of
'to be' (am, are, is, was, were, been)
- Followed by a past participle (voltooid deelwoord), like 'bitten'
- Followed by, for example, 'by a lion' OR
- If not, can it be followed by 'by zombies'?
Are all answers 'yes'?
Congratulations, you have a passive sentence.