Past Tense: When a verb is used to show that an action was completed,it is know as the past tense.

Past Tense: When a verb shows that an action was completed in the past ,it is known as simple past tense.

Formula >  Subject + Verb Second Form(Past Tense Verb) + Object

Exaples         I                            waited                                   For her.
                    You                        sang                                      a song.
                     He                        learnt                                    English. Etc  .....