English verb conjugation
MUST KNOCK

Regular verb: knock - knocked - knocked

Affirmation

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

Negation

Simple form	V-ing form
I must not knock you must not knock she must not knock we must not knock you must not knock they must not knock	I must not be knocking you must not be knocking she must not be knocking we must not be knocking you must not be knocking they must not be knocking
Perfect	V-ing perfect
I must not have knocked you must not have knocked she must not have knocked we must not have knocked you must not have knocked they must not have knocked	I must not have been knocking you must not have been knocking she must not have been knocking we must not have been knocking you must not have been knocking they must not have been knocking

Interrogative form

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

Interro-negative form

Simple form	V-ing form
must I not knock? must you not knock? must she not knock? must we not knock? must you not knock? must they not knock?	must I not be knocking? must you not be knocking? must she not be knocking? must we not be knocking? must you not be knocking? must they not be knocking?
Perfect	V-ing perfect
must I not have knocked? must you not have knocked? must she not have knocked? must we not have knocked? must you not have knocked? must they not have knocked?	must I not have been knocking? must you not have been knocking? must she not have been knocking? must we not have been knocking? must you not have been knocking? must they not have been knocking?