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Justyna Jupowicz-Kozak quote

Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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was proficient in

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "was proficient in" is correct and usable in written English.
It can be used to describe someone's skill or expertise in a particular area or subject. Example: "She was proficient in multiple programming languages, which made her an asset to the development team."

✓ Grammatically correct

News & Media

Science

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

39 human-written examples

She was a good singer, and was proficient in the piano, violin and Japanese harp.

News & Media

The New York Times

Sam Mitchell was proficient in the middle, ably assisted by captain Luke Hodge.

His Grenadian-born mother was proficient in French and taught her children the language.

News & Media

The New Yorker

Luis Martinez, the driver, chuckled when asked if he was proficient in the Asian language.

News & Media

The Economist

Downes was proficient in italian and German from his time with Scherchen.

News & Media

Independent

Mansingh was trained in Hindustani and Carnatic classical vocal music and was proficient in the Sanskrit and German languages.

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Human-verified similar examples from authoritative sources

Similar Expressions

20 human-written examples

Seventy-five percent were proficient in math, compared with 70percentt statewide.

News & Media

The New York Times

Two years later, they should be proficient in multiplying and dividing them.

News & Media

The New York Times

In New York City, 81 percent of students are deemed proficient in math, and 68.8 percent are proficient in English.

News & Media

The New York Times

In 2002, 98percentt of fourth graders who took the Elementary School Proficiency Assessment test were found to be proficient in language arts and 92percentt were proficient in math.

News & Media

The New York Times

In 2009, 96 percent of their fifth graders were proficient in English, 89 percent in math.

News & Media

The New York Times
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Expert writing Tips

Best practice

Use "was proficient in" to clearly indicate a developed skill or expertise acquired through training or experience. For instance, "She was proficient in data analysis, allowing her to extract key insights."

Common error

Be cautious about using "was proficient in" for skills that are considered basic or expected for a particular role. Instead, reserve it for skills that significantly exceed expectations. "He was proficient in email communication" is less impactful than "He was proficient in advanced statistical modeling".

Antonio Rotolo, PhD - Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

86%

Authority and reliability

4.6/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "was proficient in" functions as an adjective phrase that modifies a subject, indicating a high level of skill or competence in a specific area. As Ludwig AI confirms, it accurately and effectively describes someone's expertise, supported by numerous real-world examples.

Expression frequency: Very common

Frequent in

News & Media

40%

Science

35%

Encyclopedias

7%

Less common in

Wiki

3%

Formal & Business

0%

Social Media

0%

Ludwig's WRAP-UP

In summary, the phrase "was proficient in" is a grammatically sound and frequently used way to describe someone's developed expertise or skill in a particular area. Ludwig AI confirms its correctness and broad applicability, supported by many examples from diverse sources such as news media and scientific publications. While alternatives like "was skilled at" or "excelled in" exist, "was proficient in" is particularly effective for conveying a sense of acquired competence through training or experience. Be mindful of overstating basic skills and aim to use it when highlighting significant expertise.

FAQs

How can I use "was proficient in" in a sentence?

Use "was proficient in" to describe someone's high level of competence in a particular skill or area. For example, "She "was proficient in" several programming languages" indicates she had a strong grasp of those languages.

What are some alternatives to "was proficient in"?

Alternatives include phrases like "was skilled at", "was adept at", or "excelled in". The best choice depends on the specific context and the nuance you want to convey.

Is it better to say "was proficient in" or "had proficiency in"?

"Was proficient in" is more common and natural-sounding when describing a person's skill. "Had proficiency in" is grammatically correct but less frequently used in everyday language.

What's the difference between "was proficient in" and "was good at"?

"Was proficient in" suggests a higher degree of skill and formal training or experience compared to "was good at". "Was good at" implies a natural talent or basic competence, while "was proficient in" indicates mastery.

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Real-world application tested

Most frequent sentences: