がある

The 「がある」is used for the following purposes:
1. Announcing the existence of an object, subject, location...: These objects, subjects, or locations are not living things and do not move. They will be the subject of the sentence and are marked with the particle が.
When wanting to indicate the existence of something at a specific location, we add a noun indicating that location with the particle に. Example: テーブルにペンがあります。 (There is a pen on the table.)
2. Indicating possession by a subject: When wanting to convey that a subject possesses something, this is also the use of 「がある」. This something is typically not a living thing. Example: 彼はお金がたくさんあります。 (He has a lot of money.)
3. Indicating that an event will or has occurred at a specific location: When wanting to convey that an event will or has occurred at a specific location, 「がある」can also be used. The noun N before が indicates the event, and the noun indicating the location is followed by the particle で. Example: メキシコでメキシコとブラジルのサッカーの試合があります。 (There will be a soccer match between Mexico and Brazil in Mexico.)