Please, could anybody tell me what are the active voices of these two passive?
I think they haven’t active, but surely I’m wrong. Maybe there are many passive sentences without the correspondent active ones?
1) I want a letter written to her.
2) I’d like a car painted in red.
Thank you in advance,
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Comments  (Page 2) 
Dear friends from English Forums. For me, as a native Spanish speaker, is too difficult to say and understand a sentence like: She is written a letter.

Active:I write her a letter.
Passive: A letter is written to her = She is written a letter

Is this form: "She is written a letter" usual in spoken English or even native English speakers prefer to say (if they have to use the passive) A letter is written to her?

Thank you and excuse me for such insistance in passives!
In English, you use the passive when the active subject is either unknow or unimportant.
"she was sent a letter": somebody (unknown) sent her a letter; the conversation is focused on the lady in question.
"she was given a present" : somebody (unknown or unimportant gave her a present); the most important here is the present, or the fact that she received a present, or the conversation is focused on the lady in question.

When you know the active subject, or when the conversation is focused on him/her, then you use the active voice.
"her boss sent her a letter"
"John gave her a present"

EG, you're talking about Mr Smith, a famous architect; then you'll say "Mr Smith built this church in 1589."
On the other hand, if you're talking about the architectural curiosities of a village/city, you'll say:"this church was built in 1589 (by Mr Smith)"

This is only a part of the explanations you want, I'm going to get my thoughts together and try to explain further, and get back to you later, right?
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1) I want to write a letter to her.

2) I 'd like a car which someone painted in red.