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Prepositions after verbs

Flash across, in, before, on, or at?

Different prepositions after flash express movement, appearance, location, or direction. Some combinations are common, while others are only used in specific contexts.

Quick answer

Common uses of flash with prepositions

Use flash across for movement through a space or suddenly appearing in the mind. Use flash before mainly in literary descriptions of images appearing in front of someone. Use flash on for light or images appearing on a screen or surface. Use flash at when directing a light or look toward someone. Flash in usually introduces a place or context, not a fixed verb-preposition combination.

A smile flashed across her face.
The warning flashed on the screen.
He flashed a torch at the driver.

Choose the pattern by meaning

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

1
flash across + surface/face/mind

Showing quick movement or sudden appearance

Flash across often describes something moving rapidly over a surface or suddenly entering someone's thoughts.

Fear flashed across his face.
The idea flashed across my mind.
2
flash on + screen/display

Appearing briefly on a surface or device

Flash on is used when words, lights, or images appear suddenly on screens, signs, or displays.

Her name flashed on the monitor.
A red symbol flashed on the dashboard.
3
flash at + person/object

Directing light or an expression toward someone

Flash at is used when someone points a light, smile, or look toward another person or thing.

She flashed a smile at the audience.
The guard flashed a torch at the fence.
4
flash before + person/eyes

Appearing suddenly in front of someone

Flash before is mainly used in literary or dramatic descriptions of images or memories appearing quickly.

Scenes from childhood flashed before his eyes.
The landscape flashed before them as the train sped on.

See the difference in context

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

Construction
Example
Meaning
flash across
A memory flashed across her mind.
Sudden movement or appearance through a space or in thought.
flash on
The results flashed on the screen.
Something appears briefly on a display or surface.
flash in
Lights flashed in the distance.
In here introduces location; it is not a fixed combination selected by flash.
flash before
Images flashed before his eyes.
Something appears dramatically in front of someone.
flash at
She flashed a grin at me.
A look, light, or expression is directed toward someone.

Common mistakes

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

Using flash on for movement across a face

Use across when something moves over a surface such as a face.

✕ Relief flashed on his face. ✓ Relief flashed across his face.

Confusing flash at with flash to

Use at for directing a light, smile, or look toward someone.

✕ He flashed a torch to the cyclist. ✓ He flashed a torch at the cyclist.

Treating flash in as a fixed pattern

In often introduces a location rather than forming a special verb-preposition phrase.

✕ An idea flashed in me. ✓ An idea flashed across my mind.

Overusing flash before in everyday contexts

Flash before is more literary than across in many situations.

✕ A smile flashed before her face. ✓ A smile flashed across her face.

Quick practice

Choose the expression that matches the intended meaning.

1. A warning message flashed ___ the screen.
2. Panic flashed ___ his face for a second.
3. She flashed a quick smile ___ the reporter.

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Frequently asked questions

Is flash across idiomatic?

Yes. It commonly describes emotions, thoughts, or images moving quickly across a face or mind.

Can I say flash in my mind?

You can say something flashed in your mind, where in introduces location. Flash across my mind is more common for sudden thoughts.

Is flash before old-fashioned?

It is still used, especially in literary or dramatic writing, but it sounds more formal than flash across.

face, with, face, by facilitate by, in, with, for or through? "fade into", "fade to" or "fade from"? fail in, at, to, on or for? "fall into" or "fall in"? falter in, after, for, on or under? fantasize about, on, of or over? fare in, against, to, as or on? "fascinate by" or "fascinate with"? "fasten to", "fasten on" or "fasten with"? favor by, in, for, from or of? favour by, in, for, over or of?

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