Which part of speech is the word 'hard' in the sentence 'He is working hard'?

The correct part of speech for the word "hard" in the sentence "He is working hard" is Option A: Adverb.

To clear the confusion regarding why "hard" is an adverb in "He is working hard" as opposed to an adjective, it helps to look at the word's function in the sentence:

Understanding the Difference

• Adverbs modify verbs, adjectives, or other adverbs. They explain the how, when, where, or to what extent an action happens. In "He is working hard," the word "hard" describes how he is working, which makes it an adverb.

• Adjectives modify nouns or pronouns. They provide more information about a person, place, or thing. For example, in the sentence "This is a hard task," the word "hard" is an adjective because it is describing the noun "task."