the noun adjective pronoun question

the noun adjective pronoun question

➲ Examples of when a noun is a noun and when it acts as an adjective are
found in the following sentences.
Joseph left his empty glass on the table. (noun)
Joseph left his cup on the glass table. (adjective)
The ball sailed through the window. (noun)
The ball sailed through the window pane. (adjective)

➲ Sometimes, a pronoun is simply a pronoun. In other instances, it
is an adjective and a pronoun at the same time and is then called a
pronoun-adjective.

Several of the watches were expensive. (Several is simply a pronoun
since it replaces the names of various watches.)
Several watches were expensive. (Several is a pronoun-adjective that
describes the noun watches.)
Many of these computers were recently purchased. (Many is a pro-
noun that replaces the names of the computers.)
Many computers were recently purchased. (Many is a pronoun-
adjective that describe the noun computers.)
Some of the roads were repaired. (pronoun only)
Some roads were repaired. (pronoun-adjective)