Choose the appropriate example of the Adverb of Frequency:

The correct answer is Option (1) → "He often arrives late."

An adverb is a word that tells how, when, where or how much something happens. It can also describe an adjective or another adverb, for example she sings sweetly, very hot.

Adverb of frequency:

• Frequency means how often something happens. An adverb of frequency answers the question how often? (always, often, sometimes, never).
• In this sentence, often tells how often he arrives late.

Why the Other Options are Incorrect?

Option 2: "She sings beautifully." — Incorrect. “Beautifully” tells how she sings. So it is an adverb of manner.

Option 3: "I worked hard." — Incorrect. “Hard” tells how I worked. So it is an adverb of manner.

Option 4: "They study together for four hours." — Incorrect. “Together” tells how they study, and “for four hours” tells how long. Neither tells how often.