 For statements in the negative form, what we have to do is add the auxiliary verb to do. For subjects I, you, we, and they, we simply leave do as do, use the word not, and keep the base form of the verb now for the negative statements. However, for he, she, and it, we have to conjugate our auxiliary verb into does. We still use not, and we still keep the base form of the verb. The pattern for forming questions is very, very similar to the pattern for forming negative statements. However, what we've done is invert our subject and our auxiliary verb, so that the questions read the auxiliary verb first. Of course, again, we use do for I, you, we, and they, and use does for he, she, and it. In both cases, we've left our verb form as the base form of the verb as there's no need to change it.