The silly brown cat sat below the bright green tree sweetly singing. The bold-ed words are the adjectives in the sentence. I had no clue what you meant, but i hope this did something for you.
An adjective is a word describing a noun so usually it comes before the noun. For example, in: He picked a green banana, banana is a noun and the adjective green comes before it. In rare...
Well, it can't be in the subject of the sentence, for example [Yummy is this cookie.]The subject is usually in the predicate. But there are exceptions to every rule. Almost every.