These are the different classes into which words commonly grouped according to their form function or meaning.?

You are describing parts of speech, also known as word classes. Here's a breakdown of the most common ones:

Major Parts of Speech:

* Nouns: Words that name people, places, things, or ideas. (e.g., cat, house, happiness)

* Pronouns: Words that replace nouns. (e.g., he, she, it, they, we)

* Verbs: Words that describe actions, states of being, or occurrences. (e.g., run, think, exist, happen)

* Adjectives: Words that modify nouns or pronouns, providing more information about them. (e.g., red, beautiful, large)

* Adverbs: Words that modify verbs, adjectives, or other adverbs, providing more information about how, when, where, or to what extent something is done. (e.g., quickly, happily, here, very)

* Prepositions: Words that show the relationship between a noun or pronoun and another word in the sentence. (e.g., on, in, under, over, to, from)

* Conjunctions: Words that connect words, phrases, or clauses. (e.g., and, but, or, because, so)

* Interjections: Words that express strong emotions or sudden feelings. (e.g., Wow! Ouch! Yikes!)

Minor Parts of Speech:

* Determiners: Words that come before nouns to specify them (e.g., the, a, an, this, that)

* Articles: A type of determiner (e.g., the, a, an)

* Quantifiers: A type of determiner that expresses quantity (e.g., some, many, few, all)

* Numbers: Words that represent numerical values (e.g., one, two, three)

* Auxiliary Verbs: Verbs that help other verbs (e.g., have, be, do)

Note: There are some nuances and overlaps between these categories, and some words can function as more than one part of speech depending on their context.