there is; to be; is (living things)
States the existence or presence of a living thing (people, animals, insects) in a location.
Use がいます to say that something alive is somewhere. The thing must be living: people, animals, insects, fish. For non-living things (trees, cars, buildings), use があります instead. The subject is marked with が, and the place with に. In negative sentences, use いません. In past tense, use いました.
The pattern is neutral and can be used in both casual and polite speech, as います is the polite form of いる. In casual speech, you can say いる instead.