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Justyna Jupowicz-Kozak

CEO of Professional Science Editing for Scientists @ prosciediting.com

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combined by

Grammar usage guide and real-world examples

USAGE SUMMARY

The phrase "combined by" is not correct in standard written English.
It is typically used incorrectly; the correct phrase would be "combined with" or "combined through." Example: "The two chemicals were combined by heating them together in a controlled environment."

⚠ May contain grammatical issues

Science

News & Media

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

The received signals are combined by the STC combiner, then decoded by the polar code decoder.

Both branch outputs are combined by means of a power combiner ZN2PD2-50-S+ ZN2PD2-50-S+ ZN2PD2-50-S+

Moreover, the charges can be combined by summation only (i.e. no fractional combinations).

Two of the units were combined by a previous tenant, he said.

News & Media

The New York Times

Then I took readings for absolutely everything – gas, electric and combined, by price, kilowatts and CO2 emissions.

News & Media

The Guardian

And China, let's not forget, is projected to produce more graduates than the US and Europe combined by 2020".

News & Media

The Guardian

The standard rises to 35.5 m.p.g. for cars and trucks combined by 2016.

News & Media

The New York Times

Data was combined by census block in order to create a clear image.

News & Media

The New York Times

Both scores are combined by a simple maximum aggregation.

In this paper, our methods were combined by GMM likelihood.

These systems' outputs are combined by using ROVER.

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Expert writing Tips

Best practice

Prefer "combined with" for standard English usage. It is grammatically correct and widely accepted.

Common error

Avoid using "by" after "combined" unless you are describing the agent performing the combination (e.g. "combined by researchers"). In most other contexts, "with" is the correct preposition.

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

Antonio Rotolo, PhD

Digital Humanist | Computational Linguist | CEO @Ludwig.guru

Source & Trust

82%

Authority and reliability

2.8/5

Expert rating

Real-world application tested

Linguistic Context

The phrase "combined by" functions as a passive construction, where an action (combining) is performed on a subject. Ludwig AI notes this usage is often considered grammatically incorrect in standard English, advising instead for phrases like "combined with".

Expression frequency: Very common

Frequent in

Science

53%

News & Media

29%

Formal & Business

8%

Less common in

Encyclopedias

0%

Wiki

0%

Social Media

0%

Ludwig's WRAP-UP

The phrase "combined by" is frequently used but generally considered grammatically incorrect in standard English. Ludwig AI indicates that the more appropriate alternative is "combined with". While examples of "combined by" appear in diverse sources, including science and news, its grammatical ambiguity suggests caution in formal writing. The primary issue involves preposition choice, with "with" being the standard preposition unless specifying the agent performing the combination.

FAQs

What is the correct preposition to use with "combined"?

The correct preposition to use with "combined" is generally "with", as in "combined with". "Combined by" is only appropriate when specifying the agent that performed the combining action.

When is it appropriate to use "combined by"?

"Combined by" is appropriate when you want to specify who or what performed the action of combining. For example, "The data was "combined by researchers"".

What can I use instead of "combined by" in most cases?

In most cases, you can use "combined with" instead of "combined by". This is the grammatically correct and widely accepted alternative.

Is "combined by" grammatically correct?

According to standard English grammar, "combined by" is generally considered incorrect unless specifying the agent performing the combination. The preferred phrase is "combined with".

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Source & Trust

82%

Authority and reliability

2.8/5

Expert rating

Real-world application tested

Most frequent sentences: