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SUUPAA GA ARU

なに が ある？
What is there?
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DEPAATO WA NAI
The verb あります（ある） is used to describe what there is in a place. The negative form ありません／ない tells us what there is not.
The examples are given in the formal MASU FORM, with the PLAIN FORM in brackets in the first two examples, for your information.
まち に スーパー  が  あります（ある）。
  • There is a supermarket in the town.
まち に ​デパート  は  ありません（ない）。
  • There isn't a department store in the town.
In the negative, we use the particle は instead of が. However, が can be understood too, so don't worry too much about this detail.
​まち に スーパー と  ゆうびんきょく が  あります。
  • There is a supermarket and a post office in the town.
と = and
まち に ​スーパー も  ゆうびんきょく も  あります。
  • There is both a supermarket and a post office in the town.
With ある、...も ...も = both... and...
​まち に スーパー や  ゆうびんきょく が  あります。
  • There is a supermarket and a post office, and so on in the town​.
や also means 'and'. It is used when you are just giving a couple of examples of what there is - an incomplete list.
​In casual conversation, you will hear people say とか instead of や.
  • e.g. スーパー とか、ゆうびんきょく が ある。
          Suupaa toka, yuubinkyoku ga aru.
まち に ​スーパー  が  あります。でも、デパート  は  ありません。
  • There is a supermarket in the town. However, there isn't a department store.
まち に ​デパート  は  ありません。でも、スーパー  が　あります。
  • There isn't a department store in the town. However, there is a supermarket.
でも means 'however'. It is used to show a contrast between two sentences.
まち に ​スーパー  が  あります  けど、デパート  は  ありません。
  • There is a supermarket, but there isn't a department store in the town.
けど (or が in formal written language) means 'but'. It is used to show a contrast within the sentence. 
まち に ​デパート  も  ショッピングモール  も  ありません。
  • There is neither a department store, nor a shopping mall in the town.
With ない、...も ...も = neither... nor...