When the English verb is simple present tense, use only the verb. For other forms of the sentence, it needs a helping verb like 'do' or 'does'.
"I go to the store." - simple present "I do not go to the store." - negative sentence with 'no' "Do you go to the store?" - question "I do go to the store!" - emphatic "Does" is the same as 'do'. It is used only for 3rd person singular he/she/it. For I/we/you/they, use 'do' For past tense, use 'did' for all persons