Para practicar, visita los siguientes enlaces:
- https://agendaweb.org/exercises/verbs/present/affirmative-forms-pronouns
- https://agendaweb.org/exercises/verbs/present/affirmative-forms-1
- https://agendaweb.org/exercises/verbs/present/affirmative-forms-2
- http://www.english-room.com/grammar/presentsimpletense_affirmative_1.htm
- https://www.esl-lounge.com/student/grammar/1g1-present-simple-gap-fill.php
- https://agendaweb.org/exercises/verbs/present/negative-forms-pronouns
- https://agendaweb.org/exercises/verbs/present/negative-write.htm
- https://agendaweb.org/exercises/verbs/present/negative-write-3.htm
- https://agendaweb.org/exercises/verbs/present/interrogative-forms-pronouns
- https://agendaweb.org/exercises/verbs/present/do-does-1
- https://agendaweb.org/exercises/verbs/present/questions-write-2.htm
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