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Preposition before noun

How to use prepositions with “category”

“Category” commonly appears with “of,” “in,” and “into.” Other prepositions may belong to the wider sentence rather than forming a fixed combination.

Quick answer

Common prepositions with “category”

The most common patterns are “category of,” “in a category,” and “into a category.” “Category to” is uncommon, and “category by” usually appears in expressions such as “by category,” where “by” modifies the organisation method.

This book falls into a category of historical fiction.
They created a category of premium users.
The product is in a category of its own.

Choose the pattern by meaning

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

1
category of + thing

Naming the type or group

Use “of” to specify what the category contains.

They introduced a category of electric vehicles.
The survey includes a category of remote workers.
2
in a category

Placing something within a group

Use “in” when something belongs within a category.

The film competes in a category for new directors.
This product belongs in a category with luxury brands.
3
into a category

Classifying something

Use “into” when something is being sorted or classified.

The software sorts emails into categories automatically.
Researchers divided the data into a category based on age.
4
by category

Organising or grouping information

Use “by” to show the method of organisation.

The files are arranged by category and date.
You can search products by category online.

See the difference in context

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

Construction
Example
Meaning
category of
They created a category of special members.
Names the type or class.
in a category
Her work is in a category of its own.
Shows membership or placement within a group.
into a category
The app sorts photos into a category automatically.
Shows movement into a classification.
by category
The items are listed by category.
Shows organisation method.
category to
The change applies to every category.
“To” normally connects to another word such as a verb or adjective, not directly to “category” as a fixed phrase.

Common mistakes

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

Using “category to” as a fixed pattern

“To” usually belongs to another part of the sentence.

✕ a category to luxury goods ✓ a category of luxury goods

Confusing “in” and “into”

Use “in” for position and “into” for movement or classification.

✕ The system sorted it in a category. ✓ The system sorted it into a category.

Missing the article

Singular “category” often needs “a” or “the.”

✕ It belongs in category of sports equipment. ✓ It belongs in a category of sports equipment.

Quick practice

Choose the expression that matches the intended meaning.

1. The software divides files ___ folders.
2. Her design is ___ its own.
3. The products are arranged ___.

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Frequently asked questions

What is the difference between “in a category” and “into a category”?

“In a category” describes position or membership. “Into a category” describes movement or classification.

Is “category of” common?

Yes. It is the standard way to name a type or class of things.

Can I say “category to”?

Usually no as a direct combination. “To” normally belongs to another word in the sentence.

"behind bar" or "of bar"? "beyond description" or "of description"? by, accident, of, accident "by boat" or "of boat"? "by chance" or "of chance"? "by default", "in default" or "of default"? "by extension", "of extension" or "for extension"? "by lot" or "with lot"? by, of, for, in or agreed-upon definition? by, of, in, via or on telephone? by, of, on, for or in bus? by, of, to, with or from professor?

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