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Prepositions with nouns

On floor or of floor?

English normally uses on the floor or on a floor for location. Of floor is not a standard expression except inside longer noun phrases such as the colour of the floor.

Quick answer

Which form is correct?

Use on the floor or on a floor to describe location. The phrase of floor is generally not idiomatic by itself. Use of with floor only when floor is the object of another noun or adjective, such as edge of the floor.

The keys are on the floor by the sofa.
We work on the third floor of the building.
The tiles of the floor were damaged.

Choose the pattern by meaning

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

1
on the floor

Location on a surface inside a room

Use on the floor to say that something is physically resting on the floor.

Her bag is on the floor.
The children sat on the floor during the game.
2
on + numbered floor

Talking about levels in a building

Use on with floor numbers in buildings.

Their office is on the fifth floor.
She lives on the top floor.
3
of + the floor

Floor as part of a larger noun phrase

Use of when floor belongs to another noun phrase, not as a location expression.

The surface of the floor was slippery.
A section of the floor collapsed.

See the difference in context

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

Construction
Example
Meaning
on the floor
Your phone is on the floor.
Correct location expression.
on a floor
We stayed on the second floor.
Correct for a building level.
of floor
Incorrect: The book is of floor.
Not a standard way to express location.
of the floor
The colour of the floor changed.
Correct when floor is the object of of.

Common mistakes

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

Using of for location

Do not use of floor to mean location.

✕ The shoes are of floor. ✓ The shoes are on the floor.

Missing the article

Floor usually needs an article in location phrases.

✕ She sat on floor. ✓ She sat on the floor.

Quick practice

Choose the expression that matches the intended meaning.

1. The cat is ___ the floor.
2. They live ___ the eighth floor.
3. The colour ___ the floor was unusual.

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Frequently asked questions

Is on floor ever correct without the?

Sometimes in short notices or technical language, but standard everyday English usually says on the floor.

Can I say in the floor?

In the floor means inside the structure of the floor, such as pipes in the floor.

Why is of floor uncommon?

Because of does not normally express physical location with floor.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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