Whitin a tex: How do I use Don't, not and no? Hello Rafaela, my name is Walter. First, you have to keep in mind that Don't is the contract form of Do + not. So that leave us with these two: No and Not. No: No, answers a yes/no question. "No, the president wasn't surprised by the results of the election." No, precedes a noun that has no article. The company had no worthy rivals in the industry. No, can be used before a noun that is preceded by an adjective, as in the preceding example, but it is not used before any, much, many, or enough. Jim has no argument with which to continue the discussion. The manager had no reason to support his request for a raise. Not: Not, precedes a noun that has an article. The virus is not the source of the outbreak. Not, precedes any, much, many, or enough. Not many amateur astronomers can afford the equipment necessary to study the nova. There is not much budget left for another trial. Not, makes a verb negative. (that's why we discard Don't) They do not want to proceed with the experimental study. Note: No and not, are never used in the same sentence.