Used before nouns pronouns or other substances to form phrases functioning as modifiers of verbs nouns or adjectives; in on by to since
Noun
Nouns are often thought of as referring to persons places things states or qualities
Adverb
Word modifying a verb; typically expressed some relation of place time and manner and attended circumstance degree cause inference result condition expection confession purpose or means
Pronoun
Used to replace nouns; I you he this who what
Conjunction
Function as connectors between words phrases clauses and sentences; and because but however
