Prepositions after verbs

Engulf in or engulf by

Engulf usually takes a direct object: flames engulfed the building. In passive sentences, by introduces the cause. In can appear after engulfed to describe the surrounding condition.

Quick answer

How do you use engulf?

Use engulf as a transitive verb without a preposition: The wave engulfed the boat. In passive structures, use by for the cause: The boat was engulfed by waves. Use engulfed in for states or surroundings such as smoke, darkness, or emotion.

Flames engulfed the warehouse.
The town was engulfed by smoke.
She was engulfed in sadness.
The valley was engulfed in fog.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
engulf + object

Covering or overwhelming something

Engulf normally takes a direct object without a preposition.

The fire engulfed the entire building.
Waves engulfed the small boat.
2
be engulfed by + cause

Passive form with the source

Use by in passive sentences to name what causes the engulfing.

The city was engulfed by thick smoke.
The road was engulfed by floodwater.
3
be engulfed in + condition

Being surrounded or overwhelmed

Use in for physical surroundings or emotional states.

The mountains were engulfed in mist.
He was engulfed in grief.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
engulf in
The village was engulfed in darkness.
surrounded or overwhelmed by a condition or state
engulf by
The village was engulfed by floodwater.
passive structure naming the cause
engulf + object
The flames engulfed the house.
standard active pattern without a preposition
engulfed in thought
She sat quietly, engulfed in thought.
deeply absorbed emotionally or mentally

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Adding a preposition in active sentences

Engulf directly takes an object.

✕ The fire engulfed in the factory. ✓ The fire engulfed the factory.

Using by for emotional states

In is more natural for feelings and mental states.

✕ He was engulfed by sadness. ✓ He was engulfed in sadness.

Confusing active and passive patterns

By usually appears in passive structures.

✕ Smoke engulfed by the town. ✓ Smoke engulfed the town.

Using in for the physical cause

By is preferred when naming the thing causing the engulfing.

✓ The coast was engulfed by huge waves.

Quick practice

Choose the expression that matches the intended meaning.

1. The wildfire ___ several homes.
2. The beach was engulfed ___ smoke.
3. She felt engulfed ___ anxiety.

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Frequently asked questions

Is engulf usually followed by a preposition?

No. In active sentences, engulf normally takes a direct object.

When do we use engulfed in?

Use it for surrounding conditions or emotional states, such as engulfed in fog or engulfed in grief.

Can engulfed by and engulfed in both describe physical situations?

Yes. By focuses on the cause, while in focuses on the surrounding condition.

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