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Prepositions with fluent

Fluent in, with or at?

Fluent is normally followed by in for languages and communication systems. With and at are usually different structures rather than standard patterns.

Quick answer

Which preposition follows fluent?

Use fluent in for languages and forms of communication: fluent in Spanish. Fluent with is uncommon and usually refers to ease with tools or technology rather than language ability. Fluent at is generally not idiomatic; use good at or fluent in instead.

She is fluent in Japanese.
He became fluent in sign language.
The designer is fluent with animation software.

Choose the pattern by meaning

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

1
fluent in + language

Language ability

Use in with languages and communication systems.

They are fluent in Arabic.
She is fluent in French and Italian.
2
fluent in + technical language/style

Comfort with specialised communication

In can also describe smooth use of technical, artistic, or professional forms of expression.

He is fluent in legal terminology.
The analyst is fluent in data visualisation tools.
3
fluent with + tool/system

Ease and confidence with equipment or software

With sometimes appears when talking about practical handling of tools or systems rather than language fluency.

She is fluent with video-editing software.
The team is fluent with the new platform.

See the difference in context

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

Construction
Example
Meaning
fluent in
He is fluent in Korean.
able to speak or use a language smoothly and accurately
fluent with
She is fluent with design software.
comfortable and skilful with a tool or system; less common for languages
fluent at
Fluent at Spanish is not natural English.
generally nonstandard; use fluent in or good at depending on meaning
good at
She is good at pronunciation.
skilled in an activity rather than fluent in a language

Common mistakes

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

Using at after fluent

English normally uses fluent in, not fluent at, for languages.

✕ He is fluent at German. ✓ He is fluent in German.

Using with for language ability

With is uncommon for languages and may sound unnatural.

✕ She is fluent with English. ✓ She is fluent in English.

Confusing fluent and good at

Fluent describes smooth communication, while good at describes skill in an activity.

✕ He is fluent in grammar exercises. ✓ He is good at grammar exercises.

Quick practice

Choose the expression that matches the intended meaning.

1. Maria is fluent ___ Portuguese.
2. The engineer is fluent ___ the new software.
3. Which sentence is most natural?

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Frequently asked questions

Do we say fluent in or fluent with a language?

Standard English uses fluent in with languages: fluent in English, fluent in Mandarin.

Is fluent at correct?

Fluent at is generally not idiomatic. Use fluent in for languages or good at for skills and activities.

Can fluent with be correct?

Yes, sometimes. It can describe smooth handling of tools, software, or systems rather than language ability.

face-to-face-with-in-at-for, to "fair to" or "fair in"? faithful to, in, of, with or for? falling of, in, out, into or off? "false in" or "false to"? famed for, as, in or throughout? familiar with, to, from or in? famous for, in, of, by or as? fanatical about, in, as, for or of? "fantastic for" or "fantastic in"? far from, in, to, for or with? fascinating to, about, in, for or as?

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