are composed of

USAGE SUMMARY

'are composed of' is a correct and usable phrase in written English.
It is used to indicate that a group or collection is made up of distinct parts or elements. For example: "The class was composed of students from all over the world."

✓ Grammatically correct

Science

Encyclopedias

News & Media

Academia

Wiki

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Countries are composed of people.

The New York Times

Both are composed of carbon.

Encyclopedia Britannica

Ribosomes are composed of rRNA and protein.

Britannica

They are composed of their parts.

Yale University

All shells are composed of three parts.

Cornell University

Several of Wosene's works are composed of several panels.

The New York Times

In the college league, matches are composed of five rounds.

The New York Times - Sports

In China, rosaries are composed of coloured beads.

Britannica

Orexin neurons are composed of anatomically and functionally heterogeneous subpopulations.

Nature

They are composed of three subunits, TcA, TcB and TcC.

Nature

The islands are composed of resistant dolerite (lava) rocks.

Britannica

Expert writing Tips

Best practice

When describing the components of a complex system, use "are composed of" to clearly indicate the distinct elements that make up the whole. For example, "The committee is composed of members from various departments."

Common error

Avoid substituting "of" with other prepositions like "from" or "by". "Are composed from" or "are composed by" are grammatically incorrect. Stick with "are composed of" to maintain accuracy.

Linguistic Context

The phrase "are composed of" functions as a stative verb phrase, indicating the constitution or makeup of a subject. As Ludwig AI confirms, it is grammatically correct and widely used.

Expression frequency: Very common

Frequent in

Science

36%

Encyclopedias

20%

Academia

18%

Less common in

News & Media

15%

Wiki

9%

Formal & Business

2%

Ludwig's WRAP-UP

In summary, the phrase "are composed of" is a grammatically sound and frequently used expression to describe the components of something. Ludwig AI validates its correctness and offers numerous examples spanning diverse fields such as science, encyclopedias, news, and academia. Its usage ranges from neutral to formal registers, making it suitable for precise and descriptive writing. While "are composed of" is appropriate in many situations, consider synonyms like "consist of" or "are made up of" depending on the desired level of formality and emphasis.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

consist of

This is a more concise and direct alternative with a similar level of formality.

are made up of

This alternative is slightly more informal and emphasizes the act of creation or assembly.

are comprised of

This phrase carries a slightly more formal tone, suitable for professional and academic contexts.

include

This is a more general term indicating that something contains specified elements, without necessarily implying a complete composition.

contain

Similar to 'include', this emphasizes the presence of certain components within something.

are formed from

This alternative highlights the process of formation or construction using specific materials.

are constructed from

Similar to 'are formed from', but emphasizes a more deliberate and structured building process.

are built from

This alternative is more informal and focuses on the process of building or assembling something.

are constituted by

This phrase carries a more formal and legalistic tone, suggesting a foundational or structural composition.

are structured with

This alternative highlights the arrangement and organization of components within something.

FAQs

How can I use "are composed of" in a sentence?

Use "are composed of" to describe what something is made of. For example, "The Earth's atmosphere "is composed of" nitrogen, oxygen, and other gases".

What's a formal alternative to "are composed of"?

A more formal alternative is "are constituted by". For instance, "The governing board "is constituted by" representatives from each region".

Which is more appropriate: "are composed of" or "consist of"?

"Consist of" and "are composed of" are often interchangeable, but "are composed of" may imply a more structured arrangement. Example: "The team "consists of" experienced players" or "The alloy "is composed of" several metals".

What is the difference between "are composed of" and "are made up of"?

"Are made up of" is more informal than "are composed of", although they share similar meanings. You might say, "The cake "is made up of" flour, sugar, and eggs".