List all the definition of the grammatical parts of speech and their functions?

Sure! Here is a list of the eight grammatical parts of speech along with their definitions and functions:

1. Noun: A noun is a word that represents a person, place, thing, or idea. It can function as the subject or object of a sentence, or as the complement of a verb.

2. Pronoun: A pronoun is a word that is used in place of a noun. It can function as the subject or object of a sentence, or as the complement of a verb.

3. Verb: A verb is a word that expresses an action, occurrence, or state of being. It can function as the main predicate in a sentence, showing what the subject does or is.

4. Adjective: An adjective is a word that describes or modifies a noun or pronoun. It provides additional information about the noun or pronoun it is modifying.

5. Adverb: An adverb is a word that describes or modifies a verb, adjective, or other adverb. It provides additional information about the manner, place, time, degree, or frequency of an action or state.

6. Preposition: A preposition is a word that shows the relationship between a noun or pronoun and another word in the sentence. It indicates location, direction, time, manner, or purpose.

7. Conjunction: A conjunction is a word that connects words, phrases, or clauses. It joins words or groups of words together to create compound elements in a sentence.

8. Interjection: An interjection is a word or phrase that expresses strong emotion or surprise. It is often used to convey feelings or reactions and is usually followed by an exclamation mark.

These parts of speech play crucial roles in constructing sentences and conveying meaning in the English language.