"Teaches" is a verb. "Which" is a pronoun. which part of speech is become
Conjunctions such and, but, & or.
The word "professor" is a noun. It typically refers to someone who teaches at a college or university.
'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.
adverb
infinitive
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
Conjunction
possessive adjective adverb
Many (if not all) transitional words are adverbs.