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 performing questions is very very similar to the pattern performing 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.
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