AUX n vThe auxiliary verb do is followed by a noun group and the bare infinitive form of another verb. The auxiliary and the other verb together form the verb group. The noun group is the Subject.
|Auxiliary verb||noun group||infinitive|
This pattern with do is used to make questions with verbs in the simple present and the simple past tenses.
What do you mean?
Does she love you?
Where did they find the money?