English verb conjugation
MAY KNOCK

Regular verb: knock - knocked - knocked

Affirmation

Simple form	V-ing form
I may knock you may knock he may knock we may knock you may knock they may knock	I may be knocking you may be knocking he may be knocking we may be knocking you may be knocking they may be knocking
Perfect	V-ing perfect
I may have knocked you may have knocked he may have knocked we may have knocked you may have knocked they may have knocked	I may have been knocking you may have been knocking he may have been knocking we may have been knocking you may have been knocking they may have been knocking

Negation

Simple form	V-ing form
I mayn't knock you mayn't knock he mayn't knock we mayn't knock you mayn't knock they mayn't knock	I mayn't be knocking you mayn't be knocking he mayn't be knocking we mayn't be knocking you mayn't be knocking they mayn't be knocking
Perfect	V-ing perfect
I mayn't have knocked you mayn't have knocked he mayn't have knocked we mayn't have knocked you mayn't have knocked they mayn't have knocked	I mayn't have been knocking you mayn't have been knocking he mayn't have been knocking we mayn't have been knocking you mayn't have been knocking they mayn't have been knocking

Interrogative form

Simple form	V-ing form
may I knock? may you knock? may he knock? may we knock? may you knock? may they knock?	may I be knocking? may you be knocking? may he be knocking? may we be knocking? may you be knocking? may they be knocking?
Perfect	V-ing perfect
may I have knocked? may you have knocked? may he have knocked? may we have knocked? may you have knocked? may they have knocked?	may I have been knocking? may you have been knocking? may he have been knocking? may we have been knocking? may you have been knocking? may they have been knocking?

Interro-negative form

Simple form	V-ing form
mayn't I knock? mayn't you knock? mayn't he knock? mayn't we knock? mayn't you knock? mayn't they knock?	mayn't I be knocking? mayn't you be knocking? mayn't he be knocking? mayn't we be knocking? mayn't you be knocking? mayn't they be knocking?
Perfect	V-ing perfect
mayn't I have knocked? mayn't you have knocked? mayn't he have knocked? mayn't we have knocked? mayn't you have knocked? mayn't they have knocked?	mayn't I have been knocking? mayn't you have been knocking? mayn't he have been knocking? mayn't we have been knocking? mayn't you have been knocking? mayn't they have been knocking?