Location
Use in to describe being inside a restaurant.
In a restaurant is the normal phrase for location. Of restaurant is not used alone.
Use in a restaurant for location. Of restaurant is not idiomatic by itself, though restaurant may appear in larger noun phrases such as the owner of the restaurant.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use in to describe being inside a restaurant.
Of belongs to another noun before restaurant.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
Restaurant usually needs a or the after in.
✕ in restaurant ✓ in a restaurantOf must connect another noun to restaurant.
✕ of restaurant ✓ the manager of the restaurantIn shows location; of shows relationship.
✕ in the restaurant owner ✓ the owner of the restaurantSpecific restaurants usually need the.
✕ owner of restaurant ✓ owner of the restaurantChoose the expression that matches the intended meaning.
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Use in a restaurant or in the restaurant.
Only inside larger phrases such as owner of the restaurant.
Restaurant is a countable noun, so singular uses usually need a determiner.
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