English verb conjugation
MUST WINDOW

Regular verb: window - windowed - windowed

Affirmation

Simple form	V-ing form
I must window you must window she must window we must window you must window they must window	I must be windowing you must be windowing she must be windowing we must be windowing you must be windowing they must be windowing
Perfect	V-ing perfect
I must have windowed you must have windowed she must have windowed we must have windowed you must have windowed they must have windowed	I must have been windowing you must have been windowing she must have been windowing we must have been windowing you must have been windowing they must have been windowing

Negation

Simple form	V-ing form
I must not window you must not window she must not window we must not window you must not window they must not window	I must not be windowing you must not be windowing she must not be windowing we must not be windowing you must not be windowing they must not be windowing
Perfect	V-ing perfect
I must not have windowed you must not have windowed she must not have windowed we must not have windowed you must not have windowed they must not have windowed	I must not have been windowing you must not have been windowing she must not have been windowing we must not have been windowing you must not have been windowing they must not have been windowing

Interrogative form

Simple form	V-ing form
must I window? must you window? must she window? must we window? must you window? must they window?	must I be windowing? must you be windowing? must she be windowing? must we be windowing? must you be windowing? must they be windowing?
Perfect	V-ing perfect
must I have windowed? must you have windowed? must she have windowed? must we have windowed? must you have windowed? must they have windowed?	must I have been windowing? must you have been windowing? must she have been windowing? must we have been windowing? must you have been windowing? must they have been windowing?

Interro-negative form

Simple form	V-ing form
must I not window? must you not window? must she not window? must we not window? must you not window? must they not window?	must I not be windowing? must you not be windowing? must she not be windowing? must we not be windowing? must you not be windowing? must they not be windowing?
Perfect	V-ing perfect
must I not have windowed? must you not have windowed? must she not have windowed? must we not have windowed? must you not have windowed? must they not have windowed?	must I not have been windowing? must you not have been windowing? must she not have been windowing? must we not have been windowing? must you not have been windowing? must they not have been windowing?