I could don you could don she could don we could don you could don they could don
V-ing form
I could be donning you could be donning she could be donning we could be donning you could be donning they could be donning
Perfect
I could have donned you could have donned she could have donned we could have donned you could have donned they could have donned
V-ing perfect
I could have been donning you could have been donning she could have been donning we could have been donning you could have been donning they could have been donning
Negation
Simple form
I could not don you could not don she could not don we could not don you could not don they could not don
V-ing form
I could not be donning you could not be donning she could not be donning we could not be donning you could not be donning they could not be donning
Perfect
I could not have donned you could not have donned she could not have donned we could not have donned you could not have donned they could not have donned
V-ing perfect
I could not have been donning you could not have been donning she could not have been donning we could not have been donning you could not have been donning they could not have been donning
Interrogative form
Simple form
could I don? could you don? could she don? could we don? could you don? could they don?
V-ing form
could I be donning? could you be donning? could she be donning? could we be donning? could you be donning? could they be donning?
Perfect
could I have donned? could you have donned? could she have donned? could we have donned? could you have donned? could they have donned?
V-ing perfect
could I have been donning? could you have been donning? could she have been donning? could we have been donning? could you have been donning? could they have been donning?
Interro-negative form
Simple form
could I not don? could you not don? could she not don? could we not don? could you not don? could they not don?
V-ing form
could I not be donning? could you not be donning? could she not be donning? could we not be donning? could you not be donning? could they not be donning?
Perfect
could I not have donned? could you not have donned? could she not have donned? could we not have donned? could you not have donned? could they not have donned?
V-ing perfect
could I not have been donning? could you not have been donning? could she not have been donning? could we not have been donning? could you not have been donning? could they not have been donning?