What word can change from a verb to an adjective when ending -ing is added?

The present participle of a verb is the -ing form. The present participle of a verb is an adjective and a gerund, a verbal noun.

Examples:

Verb: The class is reading about the industrial revolution.

Adjective: I use my reading table for my computer.

Noun: Reading is my hobby.

The past participle of a verb is also an adjective.

Verb: Last month we read about the Lewis and Clark expedition.

Adjective: This is the best read book I own, everybody borrows it.