I'd be knock knocking you'd be knock knocking she'd be knock knocking we'd be knock knocking you'd be knock knocking they'd be knock knocking
Perfect
I should've knock knocked you should've knock knocked she should've knock knocked we should've knock knocked you should've knock knocked they should've knock knocked
V-ing perfect
I should've been knock knocking you should've been knock knocking she should've been knock knocking we should've been knock knocking you should've been knock knocking they should've been knock knocking
Negation
Simple form
I shouldn't knock knock you shouldn't knock knock she shouldn't knock knock we shouldn't knock knock you shouldn't knock knock they shouldn't knock knock
V-ing form
I shouldn't be knock knocking you shouldn't be knock knocking she shouldn't be knock knocking we shouldn't be knock knocking you shouldn't be knock knocking they shouldn't be knock knocking
Perfect
I shouldn't have knock knocked you shouldn't have knock knocked she shouldn't have knock knocked we shouldn't have knock knocked you shouldn't have knock knocked they shouldn't have knock knocked
V-ing perfect
I shouldn't have been knock knocking you shouldn't have been knock knocking she shouldn't have been knock knocking we shouldn't have been knock knocking you shouldn't have been knock knocking they shouldn't have been knock knocking
Interrogative form
Simple form
should I knock knock? should you knock knock? should she knock knock? should we knock knock? should you knock knock? should they knock knock?
V-ing form
should I be knock knocking? should you be knock knocking? should she be knock knocking? should we be knock knocking? should you be knock knocking? should they be knock knocking?
Perfect
should I have knock knocked? should you have knock knocked? should she have knock knocked? should we have knock knocked? should you have knock knocked? should they have knock knocked?
V-ing perfect
should I have been knock knocking? should you have been knock knocking? should she have been knock knocking? should we have been knock knocking? should you have been knock knocking? should they have been knock knocking?
Interro-negative form
Simple form
shouldn't I knock knock? shouldn't you knock knock? shouldn't she knock knock? shouldn't we knock knock? shouldn't you knock knock? shouldn't they knock knock?
V-ing form
shouldn't I be knock knocking? shouldn't you be knock knocking? shouldn't she be knock knocking? shouldn't we be knock knocking? shouldn't you be knock knocking? shouldn't they be knock knocking?
Perfect
shouldn't I have knock knocked? shouldn't you have knock knocked? shouldn't she have knock knocked? shouldn't we have knock knocked? shouldn't you have knock knocked? shouldn't they have knock knocked?
V-ing perfect
shouldn't I have been knock knocking? shouldn't you have been knock knocking? shouldn't she have been knock knocking? shouldn't we have been knock knocking? shouldn't you have been knock knocking? shouldn't they have been knock knocking?