There is a wrench, but there aren't any pliers.
Some
Use some in positive sentences:
There is some oil in the engine.
There are some cars on the street.
He is changing some parts.
Use a / an with singular nouns. Use some with plural countable nouns and uncountable nouns:
They have a nice showroom.
There are some robots in the factory.
She is driving an audi.
He is buying some gas.
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