Fast, high, near — same form as adjective and adverb

What Are Adjectives and Adverbs?

Adjectives describe nouns. Adverbs describe verbs, adjectives, or other adverbs. Usually, adjectives and adverbs have different forms. For example: 'quick' (adjective) becomes 'quickly' (adverb). However, some common English words have the same form for both adjective and adverb. These are called invariable adjectives, and they include words like 'fast', 'high', 'near', 'late', 'early', 'hard', 'slow', and 'straight'.

How to Recognize These Words

To know if a word is an adjective or adverb, look at what it describes. If it describes a noun, it is an adjective. If it describes a verb (showing how an action happens), it is an adverb. The word itself does not change, but its function in the sentence changes. For example, 'fast' in 'a fast car' is an adjective describing the noun 'car'. But 'fast' in 'he runs fast' is an adverb describing the verb 'runs'.

Common Words with the Same Form

The most useful words to remember are: fast, high, near, late, early, hard, slow, straight, wide, deep, and long. These words appear frequently in everyday English. Learning to recognize them will help you understand sentences better and write more naturally. Do not add '-ly' to these words—it would be incorrect to say 'hardly' when you mean 'in a hard way' (though 'hardly' does exist, it has a different meaning).

Fast, High, Near and More — Same Form as Adjective and Adverb

Word	Adjective Phrase	Adverb Phrase	Note
fast	a fast car	drive fast	Fastly does not exist
high	a high shelf	jump high	Highly = to a great degree (abstract)
near	the near side	come near	Nearly = almost
late	a late train	arrive late	Lately = recently
early	an early flight	leave early	Same form for both functions
hard	a hard surface	work hard	Hardly = barely / scarcely
slow	a slow pace	go slow	Slowly also correct & more formal
straight	a straight road	go straight ahead	Same form for both functions
wide	a wide river	open wide	Widely = broadly / among many
deep	a deep lake	dig deep	Deeply = intensely (abstract)
long	a long journey	stay long	Same form for both functions

Examples

She drives a fast car.

Adjective · describes noun 'car'

She drives fast.

Adverb · describes verb 'drives'

The plane flew high in the sky.

Adverb · describes verb 'flew'

That is a high mountain.

Adjective · describes noun 'mountain'

I live near the school.

Adverb · describes location of 'live'

My house is near the park.

Adjective · describes noun 'house' (though here used as a linking verb)

When to use it

Describing Speed

Use 'fast' or 'slow' as adjectives or adverbs to describe how quickly something moves or happens.

"The internet connection is fast" (adjective) or "The internet works fast" (adverb).

Describing Location or Distance

Use 'near' as an adjective or adverb to describe distance from something.

"My office is near the train station" (adjective) or "Come sit near me" (adverb).

Describing Time

Use 'early' or 'late' to describe when something happens in the same form for both adjective and adverb.

"The meeting is early" (adjective) or "We arrived early" (adverb).

Describing Height or Depth

Use 'high' and 'deep' as adjectives or adverbs without changing the form.

"The wall is high" (adjective) or "The ball flew high" (adverb).

Signal words

fast high near late early hard slow straight wide deep long

Common Mistakes

Wrong

He runs fastly to catch the bus.

✓

Correct

He runs fast to catch the bus.

Do not add '-ly' to 'fast'. The form is the same for both adjective and adverb.

Wrong

The plane flew highly.

✓

Correct

The plane flew high.

'Highly' exists but means 'very much' or 'to a great degree', not the same as 'high'.

Wrong

We arrived lately for the meeting.

✓

Correct

We arrived late for the meeting.

'Lately' means 'recently'. Use 'late' for the adverb meaning 'not on time'.

Wrong

Take a hardly left turn.

✓

Correct

Take a hard left turn.

'Hardly' means 'almost not'. Use 'hard' for the adverb meaning 'with effort or force'.

KEY TAKEAWAYS

What to Remember

Adjectives describe nouns while adverbs describe verbs, adjectives, or other adverbs.
Some common words like fast, high, and near have identical adjective and adverb forms.
Determine if a word is adjective or adverb by checking what it describes.
Words like quickly show the typical pattern where adverbs differ from their adjective forms.
Fast, hard, late, early, and slow are invariable words used as both adjectives and adverbs.

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Late vs lately — difference and usage

Adjective after linking verbs (look, feel, seem, taste)