SIMPLE PRESENT TENSE

http://www.grammar.cl/Present/Verbs_Third_Person.htm

AFFIRMATIVE FORM  http://isabelperez.com/happy/tenses/present_simple.htm

http://isabelperez.com/exer/preafimix.htm

NEGATIVE FORM   http://isabelperez.com/presentne.htm

                                 http://isabelperez.com/hotpot/prenegmix2.htm

                                  http://isabelperez.com/pr-simple-neg.htm

INTERROGATIVE FORM  http://isabelperez.com/presentq.htm