Find the wrong one(S)
- I saw injustice happen.
- I saw injustice happening.
- I saw injustice happened.
This is from a grammar competition. Now from my little knowledge. I can only break it down as, I - subject, saw- verb, injustice-object. I am not sure about which parts of speech the word 'happen' is used in different sentences. My guess is in 2 it is a participle but I have no solid basis of saying it. It's just have +ing form and to me, it looks like it is qualifying the obj - injustice in a sense. Hence, participle. But again, I may be wrong about my analysis. I have no idea about the other sentences.