UNICESMAG-PRACTICE EXERCISES

Presente Simple (todas las formas)

https://agendaweb.org/exercises/verbs/present/affirmative-negative-questions-3

https://agendaweb.org/exercises/verbs/present/affirmative-negative-questions-2


Preguntas DO/DOES
https://agendaweb.org/exercises/verbs/do-does-exercises/present-simple.htm

http://www.english-room.com/grammar/do_does.htm