Answer:
Emily: noun (a noun could be the name of a person, thing, place, etc. In this case is the name of a person).
is: verb (it express action)
always: adverb (an adverb is a modifier of a verb, an adjective or another adverb. In this case, it is modifying the word "careful").
careful: adjective (an adjective modifies or describes a noun or a pronoun. In this case it is describing Emily, which is a noun.)
with: preposition (a preposition is placed before a noun or a pronoun to modify the phrase. In this case it is placed before the noun "Tania").
Tania: noun (The name of a person).
's: Possessive adjective (modifies the noun "Tania").
stuff: noun (the name of a thing).