YOU SAID:

I am gonna go to the shop

INTO JAPANESE

私は店に行くつもりです

BACK INTO ENGLISH

I am going to a store

INTO JAPANESE

私は店に行きます

BACK INTO ENGLISH

I am going to a shop.

INTO JAPANESE

私は店に行きます。

BACK INTO ENGLISH

I will go to the store.

INTO JAPANESE

私はその店に行きます。

BACK INTO ENGLISH

I will go to that shop.

INTO JAPANESE

私はあの店に行きます。

BACK INTO ENGLISH

I will go to that shop.