I can windmill you can windmill she can windmill we can windmill you can windmill they can windmill
V-ing form
I can be windmilling you can be windmilling she can be windmilling we can be windmilling you can be windmilling they can be windmilling
Perfect
I can have windmilled you can have windmilled she can have windmilled we can have windmilled you can have windmilled they can have windmilled
V-ing perfect
I can have been windmilling you can have been windmilling she can have been windmilling we can have been windmilling you can have been windmilling they can have been windmilling
Negation
Simple form
I cannot windmill you cannot windmill she cannot windmill we cannot windmill you cannot windmill they cannot windmill
V-ing form
I cannot be windmilling you cannot be windmilling she cannot be windmilling we cannot be windmilling you cannot be windmilling they cannot be windmilling
Perfect
I cannot have windmilled you cannot have windmilled she cannot have windmilled we cannot have windmilled you cannot have windmilled they cannot have windmilled
V-ing perfect
I cannot have been windmilling you cannot have been windmilling she cannot have been windmilling we cannot have been windmilling you cannot have been windmilling they cannot have been windmilling
Interrogative form
Simple form
can I windmill? can you windmill? can she windmill? can we windmill? can you windmill? can they windmill?
V-ing form
can I be windmilling? can you be windmilling? can she be windmilling? can we be windmilling? can you be windmilling? can they be windmilling?
Perfect
can I have windmilled? can you have windmilled? can she have windmilled? can we have windmilled? can you have windmilled? can they have windmilled?
V-ing perfect
can I have been windmilling? can you have been windmilling? can she have been windmilling? can we have been windmilling? can you have been windmilling? can they have been windmilling?
Interro-negative form
Simple form
can I not windmill? can you not windmill? can she not windmill? can we not windmill? can you not windmill? can they not windmill?
V-ing form
can I not be windmilling? can you not be windmilling? can she not be windmilling? can we not be windmilling? can you not be windmilling? can they not be windmilling?
Perfect
can I not have windmilled? can you not have windmilled? can she not have windmilled? can we not have windmilled? can you not have windmilled? can they not have windmilled?
V-ing perfect
can I not have been windmilling? can you not have been windmilling? can she not have been windmilling? can we not have been windmilling? can you not have been windmilling? can they not have been windmilling?