Perfect tense

Present Perfect tense

+ : subject + has/have + V3
examples :I have opened the door since 7 O'clock
                He Has opened the window since 3 O'clock


-:subject + has/have + not +V3
  examples:I have not opened your door

?:Has?Have + S + V3
examples:Have you opened the door

Past perfect tense

+:S + Had +V3

-: S + had + Not + V3

?:Had + S + V3