созданы по проектам

Privet.
Today I found the expression:
"Улицы и площади города созданы по проектам великих архитекторов"
I understood the meaning.
But I face some difficulty understanding the strucuture. I cannot understand what is "созданы".
It functions as an adjective but it does not look to an adjective. Obviously it derives from the verb создать.
As I foreigner I would use passive voice (if I knew) and the expression would look like:
"Улицы и площади города создались by word-famous architectures".
:fool":fool"

создались is not the Passive Voice, it's the Active Voice

созданы is the Passive Voice.

Созданы is (страдательной причастие) the past particle that corresponds to the English past particle - "created"

Улицы созданы - The streets are created
Улицы были созданы - The streets were created
Улицы будут созданы - The streets will be created

;)

There are any rules of how I can create these forms from the verbs or I just need to memorize.

I found them. The most difficult is to understand when to use:
создаю́щий
создава́вший
со́зданный
созда́вший
созда́вши

Quote:

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Originally Posted by Antonio1986

There are any rules of how I can create these forms from the verbs or I just need to memorize.

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Here it is

Страдательные причастия прошедшего времени

Quote:

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Originally Posted by Antonio1986

I found them. The most difficult is to understand when to use:
создаю́щий
создава́вший
со́зданный
созда́вший
созда́вши

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I would't do all of those forms at once. It can be a can of worms (right, I get it if some people say it's easy - yeah, it is - but it can still be a confusing affair if you do it all at once). If you wanna do passive (создан...), go for it. But do not try to go for the other stuff too.

I think the OP is confused by the many ways of expressing passive:
Дома строятся. - The houses are being built. (incomplete...not finished)
Дома построены. - The houses were built. (it's complete...finished action)

Right, it's not the "sexiest" example out there. However, you shouldn't confuse reflexive verbs with those forms.

Anyway, I hope the example "kinda" helps.

Quote:

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Originally Posted by Antonio1986

I found them. The most difficult is to understand when to use:
создаю́щий
создава́вший
со́зданный
созда́вший
созда́вши

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создающий ~present active participle 'the one who is creating': this can be substituted by a который clause.
создавая ~ while creating ...
создавший ~ past active participle, 'the one who created', который clause possible instead
создавши ~ having created... [example: Премудрый Бог, создавши человека Сказал: "Нехорошо быть одному"] can find examples online.

созданный - adjective attached to the thing created: создан /а/о/ы short forms.

Quote:

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Originally Posted by Seraph

создавши ~ having created... [example: Премудрый Бог, создавши человека Сказал: "Нехорошо быть одному"] can find examples online.

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"Создавши" is an old fashioned word, that's why you used example from a religious book. Now you should use "создав" instead.

Цукерберг стал миллиардером, создав "Facebook".
Генерал начал наступление, создав трудности противнику.

Note that "созданы" is a short form participle. Adjectives and participles take short form only when used as a predicate.