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Preposition before noun

"Of case" or "In case"?

The common English expression is "in case". "Of case" is not a standard phrase in modern English except in very specialised grammar or legal contexts.

Quick answer

Which form is correct?

Use "in case" to mean "because something might happen" or "if something happens". The phrase "of case" is generally not idiomatic as a fixed expression.

Take an umbrella in case it rains.
I saved the receipt in case I needed a refund.
Call me in case there are delays.

Choose the pattern by meaning

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

1
in case + clause

Preparing for a possible situation

Use "in case" before a clause about something that might happen.

in case the train is late
Pack extra batteries in case we lose power
2
just in case

Taking precautions

Use "just in case" for extra caution or preparation.

I brought a jacket just in case.
She copied the files just in case something went wrong.
3
in case of + noun

Referring to a possible event

Use "in case of" before a noun phrase naming an event or problem.

in case of emergency, press the alarm.
The number is available in case of accidents.

See the difference in context

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

Construction
Example
Meaning
in case
Take some water in case you get thirsty.
Used for possible future situations or precautions.
in case of
In case of fire, leave the building immediately.
Used before a noun naming a danger, event, or situation.
of case
The phrase "of case" is not normally used in everyday English.
Generally nonstandard as a fixed expression.

Common mistakes

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

Using "of case" instead of "in case"

English uses the fixed expression "in case" for precautions or possible situations.

✕ Bring a map of case we get lost. ✓ Bring a map in case we get lost.

Using "in case" with impossible situations

"In case" usually refers to realistic possibilities.

✕ Take your coat in case the sun explodes. ✓ Take your coat in case it gets cold.

Confusing "in case" and "if"

"In case" means preparation before something happens. "If" refers to the condition itself.

✕ I will call you in case I arrive early. ✓ I will call you if I arrive early.

Quick practice

Choose the expression that matches the intended meaning.

1. Take some snacks ___ the meeting runs late.
2. ___ emergency, dial this number.
3. Which expression is standard in everyday English?

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Frequently asked questions

Is "of case" ever correct?

It is not a normal fixed phrase in modern English. It may appear in specialised technical or legal wording, but not in everyday use.

What does "in case" mean?

It means preparing for a possible event or situation.

What is the difference between "in case" and "in case of"?

Use "in case" before a clause and "in case of" before a noun phrase.

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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