English verb conjugation
MUST WINDOW

Regular verb: window - windowed - windowed

Affirmation

Simple form	V-ing form
I must window you must window he must window we must window you must window they must window	I must be windowing you must be windowing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he window? must we window? must you window? must they window?	must I be windowing? must you be windowing? must he 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 he 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 he 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 he 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 he 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 he 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 he not have been windowing? must we not have been windowing? must you not have been windowing? must they not have been windowing?