Many English verbs are action words, expressing what is happening (do, work). Some verbs are state words, expressing a situation (be, have).
Nouns represent people (teacher, Mary), places (town, Asia) and things (table, music).
An adjective is a word that tells us more about a noun (big, red, expensive).
An adverb tells us more about a verb, an adjective or another adverb (loudly, really, extremely).
Determiners are words like the, an, this that start a noun phrase.
A preposition expresses the relationship of a noun or pronoun to another word (at, in, on, from).
Pronouns are small words like you, ours, some that can take the place of a noun.
Conjunctions join two parts of a sentence (and, but, though).
Interjections are short exclamations with no real grammatical value (ah, dear, er).
The idea that the ability to learn a language is built into the human brain
Whenever you correct someone's grammar just remember that nobody likes you. Jim Gaffigan