Voted Best Answer
Mar 02, 2018 - 11:45 AM
If the sentence were "Comemos en ese lugar todos los dias," it would be "We eat in/at that restaurant every day."
Since "ir" (voy) is used, we need the preposition "a" to express "to/at."
Voy a comer. I go to eat.
Voy a ese lugar. I go to that place.
Voy a comer a ese lugar. I go to eat at that place.
The conjugated verb is the one to pay attention to in these cases. Comer is in the infinitive in this sentence, so the place is not where the person is eating, but where they are going.
A trick in English grammar is to remove parts of a sentence, and if the sentence still makes sense, you can see what the appropriate word usage is. I use this with Spanish as well, and it's worked for me so far!