Passive Voice *--*

FEATURES
1. It is said that a sentence is in active voice when the meaning of the verb is produced by the grammatical person to whom it refers:
Pedro de Mendoza Founded Buenos Aires.
(Pedro de Mendoza founded Buenos Aires).
2. It is said that a sentence is in passive voice when the meaning of the verb is received by the grammatical person to whom it refers:
Buenos Aires WAS Founded by Pedro de Mendoza.
(Buenos Aires was founded by Pedro de Mendoza).
3. Is formed with the auxiliary verb to be and the past participle of the verb is conjugated.
4. The addition to the active sentence becomes the passive subject. As in Castilian, the subject can be kept active as an agent.
5. When a verb has two plug-ins can make two passive structures:
a) A book WAS sat to Tom by Mr. Smith, a book was sent to Tom by Mr. Smith.
b) WAS Tom sat a book by Mr. Smith (passive language). This structure is not possible in Castilian.
MODEL OF WORD IN PASSIVE VOICE
BE SEEN TO BE SEEN =
THIS
I am seen, I am seen
You are seen, are seen
I is seen, is seen
We Are seen, we are seen
You are seen, you are seen
They Are seen, are seen

Perfect tense
I Have Been seen, I have seen
You Have Been seen, has been seen
I've Been seen, has been seen
We Have Been seen, we have seen
You Have Been seen, have been seen
They Have Been seen, have been seen
PAST
I Was seen, I saw
Were you seen, you were seen
He Was seen, was seen
we where seen, were seen
Were you seen, you were seen
They Were seen, were seen

FUTURE
I Shall Be seen, will be seen
You Will Be Seen, will be seen
I Will Be seen, be seen
We Shall Be Seen, will be seen
You Will Be seen, you will be seen
They Will Be seen, be seen
Past Perfect: I Had Been seen, had been seen
CONDITIONAL: I Should Be seen, be seen
FUTURE PERFECT: I Shall Have Been seen, I will have been seen
CONDITIONAL PERFECT: I Should Have Been seen, would have been seen
http://www.ompersonal.com.ar/omgrammar/vozpasiva.htm