They are both indefinite articles (indef. art.) e.g. "A piece of paper," meaning it could be any piece (indefinite) as opposed to the definite article (def. art.) "the," e.g. "The piece of paper," meaning a specific piece (definite.)
The part of speech that connects words and sentences is called a conjunction.
"Teaches" is a verb. "Which" is a pronoun. which part of speech is become
'His' and 'he' are pronouns
Suffixes are parts of words, therefore they are not parts of speech. Parts of speech are full words like LOGICAL - CAL is a part of that word that is an adjective.
He, she, and it are pronouns, which are a part of speech that replace nouns to avoid repetition in a sentence.
infinitive
adverb
If "get along with" is considered a small enough number of words to have a part of speech as a phrase, it is a verb.
nothing
possessive adjective adverb
Conjunction
Many (if not all) transitional words are adverbs.