Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I may knock knock you may knock knock she may knock knock we may knock knock you may knock knock they may knock knock
V-ing form
I may be knock knocking you may be knock knocking she may be knock knocking we may be knock knocking you may be knock knocking they may be knock knocking
Perfect
I may have knock knocked you may have knock knocked she may have knock knocked we may have knock knocked you may have knock knocked they may have knock knocked
V-ing perfect
I may have been knock knocking you may have been knock knocking she may have been knock knocking we may have been knock knocking you may have been knock knocking they may have been knock knocking
Negation
Simple form
I mayn't knock knock you mayn't knock knock she mayn't knock knock we mayn't knock knock you mayn't knock knock they mayn't knock knock
V-ing form
I mayn't be knock knocking you mayn't be knock knocking she mayn't be knock knocking we mayn't be knock knocking you mayn't be knock knocking they mayn't be knock knocking
Perfect
I mayn't have knock knocked you mayn't have knock knocked she mayn't have knock knocked we mayn't have knock knocked you mayn't have knock knocked they mayn't have knock knocked
V-ing perfect
I mayn't have been knock knocking you mayn't have been knock knocking she mayn't have been knock knocking we mayn't have been knock knocking you mayn't have been knock knocking they mayn't have been knock knocking
Interrogative form
Simple form
may I knock knock? may you knock knock? may she knock knock? may we knock knock? may you knock knock? may they knock knock?
V-ing form
may I be knock knocking? may you be knock knocking? may she be knock knocking? may we be knock knocking? may you be knock knocking? may they be knock knocking?
Perfect
may I have knock knocked? may you have knock knocked? may she have knock knocked? may we have knock knocked? may you have knock knocked? may they have knock knocked?
V-ing perfect
may I have been knock knocking? may you have been knock knocking? may she have been knock knocking? may we have been knock knocking? may you have been knock knocking? may they have been knock knocking?
Interro-negative form
Simple form
mayn't I knock knock? mayn't you knock knock? mayn't she knock knock? mayn't we knock knock? mayn't you knock knock? mayn't they knock knock?
V-ing form
mayn't I be knock knocking? mayn't you be knock knocking? mayn't she be knock knocking? mayn't we be knock knocking? mayn't you be knock knocking? mayn't they be knock knocking?
Perfect
mayn't I have knock knocked? mayn't you have knock knocked? mayn't she have knock knocked? mayn't we have knock knocked? mayn't you have knock knocked? mayn't they have knock knocked?
V-ing perfect
mayn't I have been knock knocking? mayn't you have been knock knocking? mayn't she have been knock knocking? mayn't we have been knock knocking? mayn't you have been knock knocking? mayn't they have been knock knocking?