English verb conjugation
CAN WINDOW

Regular verb: window - windowed - windowed

Affirmation

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

Negation

Simple form	V-ing form
I can't window you can't window he can't window we can't window you can't window they can't window	I can't be windowing you can't be windowing he can't be windowing we can't be windowing you can't be windowing they can't be windowing
Perfect	V-ing perfect
I can't have windowed you can't have windowed he can't have windowed we can't have windowed you can't have windowed they can't have windowed	I can't have been windowing you can't have been windowing he can't have been windowing we can't have been windowing you can't have been windowing they can't have been windowing

Interrogative form

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

Interro-negative form

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