Past tense & Future tense

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Past tense: The past tense is a tense whose principle function is to place an action or situation in past time. past tense is differentiated in four categories. 1.indefinite, 2.continuous, 3.perfect and 4.perfect continuous. 
Past indefinite: Past indefinite tense is used to denote an action completed in the past or a past habit and result is not lasted.
                                      Structure: Subject+ past form of main verb+ Object
                                       Example: I ate rice.
                                                        He went to Dhaka.

 Past continuous: Past continuous tense is used when the action was continued for some time in the past.
                                  Structure: Subject+ was/were+ ing form of main verb+ Object
                                    Example: He was walking there.
                                                      They were playing Cricket.
Note: If the subject is a first person or a third person singular number then 'was' will be added after subject And if the subject is a plural number then 'were' will be added after subject.

 Past perfect: Past perfect tense is used in the former action between two completed actions of the past and simple past is used in the later action.
                              Structure: 1st subject+ had+ past participle form of main verb+ 2nd subject+ past 
                                                form of main verb+ 2nd object.
                                Example: My brother had come before I ate rice.
                                                The patient had died before the doctor came.
                               
Past perfect continuous: Past perfect continuous tense is used for an action that begun before a certain point in the past and continued up to that time.
                           Structure: 1st subject+ had been+ ing form of main verb+ 1st object+ 2nd subject
                                            + past form verb+ 2nd object
        Example: I had been watching television before he came.
                                             We had been playing before the bell rang.
Future tense: Future tense is a verb form that generally marks the event described by the verb as not having happened yet, but expected to happen in the future.
Future indefinite: Future indefinite tense is used when an action will be done or will happen in future.
                      Structure: Subject+ shall/will+ verb+ Object
                        Example: I shall go there.
                                         They will go to village.

 Future continuous: This tense is used when an action is thought to be going on in the future.
                                  Structure: Subject+ shall be/will be+ ing form of main verb+ object
                                   Example: I shall be reading the book.
                                                   Raju will be doing the work.

 Future perfect: This tense is used to indicate the completion of an action by a certain time in the future.
                       Structure: 1st subject+ shall have/will have+ past participle form of verb+ 1st object+ 
                                           before+ 2nd subject+ main verb+ 2nd object
                        Example: I will have done the work before he come.
                                         He will have sang a song before you leave.

 Future perfect continuous: This tense is used when an action will have been continuing by a certain future time.
                    Structure: 1st subject+ shall have been/will have been+ ing form of main verb+ 
                                        1st object+ 2nd subject+ main verb+ 2nd object.
                       Example: I will have been waiting for you until you come back
                                         He will have been playing football before they come.

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