Number (2) is fine, correct and natural.
Number (3) should say, 'Some money was given to her.'
Number (5) is close, but the 'to' should be replaced with 'by him': 'She was given some money by him.' However, you could omit both so it's exactly the same as Number (2).
Number (6) is fine, correct and natural.
As for the best way to get this into the passive voice, I would say 'She was given some money by him' is your best option.
This is a silly question. It asks one to do something that can't be done.
The sentence
- I must go and look for my brothers.
is Intransitive, but Passive can only apply to a Transitive clause.
The Passive rule promotes the direct object to subject, demotes the old subject to an optional object of by, and adds the auxiliary verb be before the past participle form of the main transitive verb. Like this:
- Marie shot my cousin. == Passive => My cousin was shot (by Marie).
But if the clause isn't transitive, there isn't a direct object to promote, and other noun phrases don't usually work.
- Mary slept all day. but not *All day was slept (by Mary).
Sometimes prepositional objects can be passivized, if the preposition is one that makes a transitive verb out of an intransitive one, like look (at) or listen (to)
- We must look at/listen to that again. == Passive => That must be looked at/listened to again.
But that's rarely the case, so most prepositions after verbs don't mark direct objects. And without a direct object, Passive is impossible.
The real solution is to get a new textbook that actually describes English, instead of something like English.
Best Answer
"wait" cannot be made passive. To be made passive, a verb must have an actor and something that is acted upon. Verbs like "wait, sleep" and others have an actor -- the person doing the waiting or the sleeping -- but not a object of the action. That is, you don't "wait something" or "sleep something," so, they can't be made passive.