Question

Why do we use "the" after"of" in "some of the boys"

Answer 1

Answer:

"The" in this context refers to the specific boys you are talking about. If "the" is not used it may be assumed as any random or common boys.

Answer 2

Answer: The is used here as a word to join the phrase to make sense out of it. If the was not used, the phrase would be - some of boys - which doesn't sound correct and gives a feeling that the phrase is not completed, or proper.

Also, the is used to refer a particular group of boys and not any group.

Hope it helps :)

Thank you