Noun phrases

Noun phrases normally consist of a head noun, which is optionally modified ("premodified" If the modifier is placed before the noun; "postmodified" if the modifier is placed after the noun). Possible modifiers include:
determiners: articles (the, a), demonstratives (this, that), numerals (two, five, etc.), possessives (my, their, etc.), and quantifiers (some, many, etc.). In English, determiners are usually placed before the noun;
adjectives (the red ball); or
complements, in the form of a prepositional phrase (such as: the student of physics), or a That-clause (the claim that the earth is round);
modifiers; pre-modifiers if placed before the noun and usually either as nouns (the university student) or adjectives (the beautiful lady), or post-modifiers if placed after the noun. A postmodifier may be either a prepositional phrase (the man with long hair) or a relative clause (the house where I live). The difference between modifiers and complements is that complements complete the meaning of the noun; complements are necessary, whereas modifiers are optional because they just give additional information about the noun.

en.wikipedia.org/wiki/Noun_phrase

Passive voice

Use of Passive

Passive voice is used when the focus is on the action. It is not important or not known, however, who or what is performing the action.

Example: My bike was stolen.

In the example above, the focus is on the fact that my bike was stolen. I do not know, however, who did it.

Sometimes a statement in passive is more polite than active voice, as the following example shows:

Example: A mistake was made.

In this case, I focus on the fact that a mistake was made, but I do not blame anyone (e.g. You have made a mistake.).
Form of Passive

Subject + finite form of to be + Past Participle (3rd column of irregular verbs)

Example: A letter was written.

When rewriting active sentences in passive voice, note the following:
the object of the active sentence becomes the subject of the passive sentence
the finite form of the verb is changed (to be + past participle)
the subject of the active sentence becomes the object of the passive sentence (or is dropped)

www.ego4u.com/en/cram-up/grammar/passive