Choose the correct negative sentence. a) we do not eat soup for breakfast b) they do not shopping today c) he does not buy some books

a) we do not eat soup for breakfast - Here's been described a common situation that people do every single day. That's why this one is correct.

b) they do not shopping today. Here we are supposed to use Present Perfect tense because there is a word "today". Correct one should be: "they have not done shopping today".

c) he does not buy some books. Here would be better to use Present Perfect tense because we can see a result of action. Correct one is: he has not bought any books.