Inglés

-Present Simple:
     - Subject + vb infinitive without to + complement
                        Ex: I play football.
     - Subject + 3rd p. singular: -s                                  = Affirmative
                        Ex: She plays football.


     - Subject + don´t/doesn´t + vb infinitive without to + complement  
                        Ex: I don´t study English                                                     =Negative
                              She doesn´t study English


     - Do/Doesn´t + subject + vb infinitive without to + complement + ?
                       - Short answers: + = Yes + subject + do/does
                                                  -  =  No + subject + don´t/ doesn´t             =Interrogative
                       -Ex: Do you like playing tennis?                                
                               Does she like playing tennis?