Answer:
an Adjective is a word or phrase naming an attribute, added to or grammatically related to a noun to modify or describe it.
A Verb is a word used to describe an action, state, or occurrence, and forming the main part of the predicate of a sentence, such as hear, become, happen.
a noun is a word (other than a pronoun) used to identify any of a class of people, places, or things ( common noun ), or to name a particular one of these ( proper noun ).
Explanation:
A.I'm not satisfied with your explanation of where you <u>were</u> last night.
b.I came into the room when Mary <u>was playing</u> the piano.
c.no error!!!
d.There <u>are</u> some sheep in the field.
e.Playing the drums and singing<u> is </u>difficult.
Answer:
knowledge is the common noun in this sentence.
Due to English punctuation eating is just an action where a drink is something like a soda and a action. A eat is not a meal or anything that can be consumed.