1. Noun
"John is a well known person." Here "John" and "Person" is called noun in the term of parts of speech.
2. Pronoun
"John is a teacher. He teaches very well." Here "He" is a pronoun because it is used instead of noun.
3. Adjective
"John is a good teacher" here "good" is called adjective because it describes more about noun.
4. Verb
"John teaches very well" here 'teaches' is a verb because it is show an action or state of a noun or pronoun.
5. Adverb
"John teaches very well." Here 'very' is an adverb because it is add more in the meaning of verb, adjective, and adverb.
6. Preposition
" The book is on the table" here "on" is called preposition because it connects noun or pronoun with other noun or pronoun in the same sentence.
7. Conjunction
"John is a teacher and he teaches an English" here "and" is a conjunction because it connects or links two nouns, two phrases or two sentences.
8. Interjection
"Oh my God!" They lost the match. Here " Oh my God!" is the interjection.
9. Article
"The most beautiful capital of the world is a London". Here is "The" and "a" is an articles but "The" is a definite article while "a" is a an indefinite article.