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 mustn't window you mustn't window he mustn't window we mustn't window you mustn't window they mustn't window	I mustn't be windowing you mustn't be windowing he mustn't be windowing we mustn't be windowing you mustn't be windowing they mustn't be windowing
Perfect	V-ing perfect
I mustn't have windowed you mustn't have windowed he mustn't have windowed we mustn't have windowed you mustn't have windowed they mustn't have windowed	I mustn't have been windowing you mustn't have been windowing he mustn't have been windowing we mustn't have been windowing you mustn't have been windowing they mustn't 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
mustn't I window? mustn't you window? mustn't he window? mustn't we window? mustn't you window? mustn't they window?	mustn't I be windowing? mustn't you be windowing? mustn't he be windowing? mustn't we be windowing? mustn't you be windowing? mustn't they be windowing?
Perfect	V-ing perfect
mustn't I have windowed? mustn't you have windowed? mustn't he have windowed? mustn't we have windowed? mustn't you have windowed? mustn't they have windowed?	mustn't I have been windowing? mustn't you have been windowing? mustn't he have been windowing? mustn't we have been windowing? mustn't you have been windowing? mustn't they have been windowing?