Present Simple

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

Present Continuous

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

                                    
PRESENT SIMPLE VS. PRESENT CONTINUOUS
                       
                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,

Past Simple                        

                       1, 2, 3,4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21

                                to be
           
                                                 1, 2, 3, 4, 5, 6, 7, 8, 9

                                was / were
 
                                                 1, 2, 3, 4, 5, 6, 7, 8,

Present Perfect Continuous

                        1, 2, 3, 4, 5, 6, 7, 8,
Past Simple

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Used to

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Past Continuous

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10

 Past Perfect

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10,

Past  Perfect Continuous

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Future Simple - will

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10

                        to be going to

                        1, 2, 3, 4, 5, 6, 7, 8, 9, 10