Sheila’s(adj) mother(n) can(v) drive(v) us(pn) to(prep) the(adj) mall(n).
That(adj) song(n) is(v) stuck(adj) in(prep) my(adj) head(n).
The(adj) teacher(n) handed(v) the(adj) math(adj) test(n) back(adv) today(adv).
There are no words italicized in the question, so I labeled them all according to the following information.
A noun (n) is a person, place, thing or idea. Nouns are often the subject of the sentence or an object in the sentence.
A pronoun(pn) takes the place of a noun. They refer back to a noun and can show gender.
An adjective(adj) describes a noun. It is often found directly in front of a noun. The, a, an are all considered adjectives, and have their own subcategory of adjectives, so they can also be called articles.
A verb (v) is an action or state of being word. Action verbs are easy to identify as they are things that you can do. State of being verbs connect the subject to its description.
An adverb (adv) describes verbs, adjectives, or other adverbs. They can answer the question: when? where? how? how often?
A preposition (prep) is a word that tells where one noun is in relation to another noun. A preposition is always followed by a noun.