was knocked his tooth out or was knocked his tooth out of

Question

She knocked out his tooth.

If I change this sentence into passive,

1.He was knocked his tooth out.

2.He was knocked his tooth out of.

Which is suitable and grammatical?

Answer 1

The subject of a passive sentence must be an object of the verb or an 'oblique'—object of a preposition phrase—affected by the verb in the active version. In your base active sentence the only entity which qualifies is his tooth:

His tooth was knocked out (by her).

Because HE is neither an object nor an oblique but a possessive it can't be cast as a passive subject.

To cast HE as subject in this sort of context we don't use the passive but an 'experiential' HAVE or GET:

He had/got his tooth knocked out (by her).

This is not a passive but it has much the same effect.