The passive voice requires two parts:
1. the verb to be in one of its tenses
2. the past participle of a verb
a. I was told the good news about my grammar exam.
b. I am not being taken for a fool.
To change a verb voice from the active to the passive:
1. use the same verb tense:
Somebody stole my wallet. (simple past)... My wallet was stolen.
2. Make sure you know the past participle of the verb:
Somebody is seeking
me at the moment for information leading to an arrest.
At the moment, I am being sought for information leading to an arrest.
3. Decide whether the 'by phrase' is necessary or not to the meaning of the sentence:
compare: I was told by someone... I was told by my teacher. (first one doesn't require the 'by phrase' for the complete meaning)
Remember the reasons for using the passive:
1. You don't know who did the action.
2. You don't want to know or reveal who did the action.
3. Everyone knows who did the action; it's obvious who did it.
4. Common statements like announcements.
5. To better connect parts of a sentence or paragraph.