A N S W E R :
Conjunctions are nothing but the words that join two or more phrases, words and sentences.
Have a look at the given sentences!
[tex] \twoheadrightarrow[/tex] She bought a shirt and a book.
Here, and has been used to join two words that is, shirt and book. Therefore, and is the conjunction here.
[tex] \twoheadrightarrow[/tex] You can write your paper with a pen or a pencil.
Here, or has been used to join two words that is, pen and pencil. Therefore, or is the conjunction here.
