It´s for habits. You use the auxiliars do/does for questions and add NOT when it´s a negative.
In the affirmative, remember to add -ES ( verbs ended in -ss, -ch-sh, -o) or -IES (when Y is after a consonant). When you have the negative, you don´t need it because you have DOES to indicate.
The word order! Affirmative: S V O Negative: S Aux+NOT V Interrogative: Aux S V
Present continuous:
It´s for actions now, exceptions, near future, future scheduled.
Auxiliar: verb to be ( AM, IS,ARE)
The word order: Affirmative: S Aux [ V+ING ] Negative: S ( Aux + NOT ) [ V+ING ] Interrogative: Aux S [ V+ING ]
Past Simple:
It´s for FINISHED ACTIONS in the past.
Auxiliar: DID
Regular verbs: Just add ED to the verb in the affirmative. Irregular verbs: Check here.
The word order! Affirmative: S V O Negative: S Aux+NOT V Interrogative: Aux S V
ATTENTION: negative and interrogative CAN´T HAVE THE VERB IN THE PAST!
Eg: She liked apples. Neg: She did not LIKE apples. Int: Did she LIKE apples?
Future with will:
It´s for distant future and actions decided at the moment of speaking.
Auxiliar: WILL
The word order!
Affirmative: S Aux V Negative: S Aux+ NOT V Interrogative: Aux S V
And don´t forget: once in hell, ask the devil for a dance. ;-)