Answer:
Sorry I can only help with the last one.
Step-by-step explanation:
An adjective is a word that is used to modify a noun in a sentence. For example, This Pen Is Red. The adjective is Red because it tells more of the noun, Pen.
A preposition, is a word used with a noun or pronoun to make its relation with another word in the sentence. Not to be confused with a conjunction, which is used to join two different words or phrases or clauses.
A noun is the name of a person, an animal, a place, or a thing. America is a noun because it's a place, you are a noun because you are a person.
Hope it helped. ♥