あります
there is, have (things)
Place に + thing が + あります
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あります says a thing exists or is somewhere: 机の上に本があります, "there's a book on the desk". It's for things without a life of their own: objects, plants, buildings, events. People and animals use います instead.
The usual order is place に, thing が, あります. When you're asking where something is, the thing becomes the topic instead: 本はどこにありますか.
あります also means "have": 時間がありません, "I don't have time"; 明日テストがあります, "I have a test tomorrow".
The plain form is ある, and its negative is simply ない, not あらない.
Register: Polite. Plain: ある, and its negative is simply ない.
Examples
机の上に本があります。
There's a book on the desk.
駅の前に銀行があります。
There's a bank in front of the station.
今日は時間がありません。
I don't have time today.
明日、テストがあります。
I have a test tomorrow.
この町には大きい公園がありません。
This town doesn't have a big park.
冷蔵庫に牛乳があるよ。
There's milk in the fridge.