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Prepositions after verbs

Illuminate with or by?

Illuminate usually takes with for the source or means of light. By can appear in passive-style phrases, while at, for, and in are usually separate adverbial phrases rather than fixed combinations.

Quick answer

Most common patterns with illuminate

Use illuminate with to mention the light source or method. Use illuminate by mainly in passive constructions such as illuminated by candles. Phrases with at, for, or in usually describe place, purpose, or context rather than a fixed verb-preposition combination.

The path was illuminated by lanterns.
They illuminated the hall with soft lighting.
The painting was illuminated in the gallery entrance.

Choose the pattern by meaning

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

1
illuminate with + light source

Showing the means of lighting

Use with to say what provides the light or clarity.

The designer illuminated the room with hidden LEDs.
The article illuminates the issue with clear examples.
2
illuminated by + source

Describing what gives light

By is common in passive constructions.

The street was illuminated by neon signs.
The manuscript was illuminated by candlelight.
3
illuminate in + place

Referring to location or context

In usually introduces a place or situation, not a fixed verb-preposition pattern.

The sculpture was illuminated in the central courtyard.
Important themes are illuminated in the final chapter.

See the difference in context

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

Construction
Example
Meaning
illuminate with
They illuminated the stage with spotlights.
uses with for the instrument or source
illuminated by
The tunnel was illuminated by emergency lamps.
passive pattern showing the source of light
illuminate at
The sign was illuminated at night.
at introduces a time expression, not a fixed combination
illuminate for
The guide illuminated the topic for new students.
for introduces the people who benefit
illuminate in
The details are illuminated in the report.
in introduces a place or context

Common mistakes

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

Using at as a fixed complement

At usually gives a time or place detail, not the object of illuminate.

✕ The artist illuminated at the room. ✓ The artist illuminated the room with candles.

Using by in active sentences unnaturally

By is most natural in passive constructions.

✕ They illuminated by torches the cave. ✓ They illuminated the cave with torches.

Confusing in with with

Use with for the means of lighting.

✕ She illuminated the desk in a lamp. ✓ She illuminated the desk with a lamp.

Quick practice

Choose the expression that matches the intended meaning.

1. The corridor was illuminated ___ small lanterns.
2. They illuminated the garden ___ solar lights.
3. The monument is illuminated ___ night.

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Frequently asked questions

Is illuminate with correct?

Yes. Use illuminate with to mention the source or method of lighting.

Can I say illuminated by?

Yes. Illuminated by is very common in passive constructions.

Is illuminate at grammatical?

Only when at introduces time or place information, such as at night. It is not usually a fixed verb-preposition combination.

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