Perfect Tense (PPT)

Guys, this is Present Perfect Tense

(+) S + has/have + Verb3

      Example :   -   I have opened the door since 7 o’clock.

-      He has opened the door since 7 o’clock.

(-) S + has/have + not + verb3

    Example :  -    I have not opened the door.

-      She has not opened the door.

     (?) has/have + S + Verb3

       Example :   -    Have you opened the door ?

-      Has she opened the door ?

     This is Past Perfect tense

     (+) S + had + Verb3

       Example :   He had eaten the food before his mother arrived.

     (-) S + had + not + Verb3

       Example :   He had not eaten the food before his mother arrived.

     (?) Had + S + Verb3 ?

          Example :   Had he eaten the food before his mother arrived ?