I could aim you could aim he could aim we could aim you could aim they could aim
V-ing form
I could be aiming you could be aiming he could be aiming we could be aiming you could be aiming they could be aiming
Perfect
I could have aimed you could have aimed he could have aimed we could have aimed you could have aimed they could have aimed
V-ing perfect
I could have been aiming you could have been aiming he could have been aiming we could have been aiming you could have been aiming they could have been aiming
Negation
Simple form
I could not aim you could not aim he could not aim we could not aim you could not aim they could not aim
V-ing form
I could not be aiming you could not be aiming he could not be aiming we could not be aiming you could not be aiming they could not be aiming
Perfect
I could not have aimed you could not have aimed he could not have aimed we could not have aimed you could not have aimed they could not have aimed
V-ing perfect
I could not have been aiming you could not have been aiming he could not have been aiming we could not have been aiming you could not have been aiming they could not have been aiming
Interrogative form
Simple form
could I aim? could you aim? could he aim? could we aim? could you aim? could they aim?
V-ing form
could I be aiming? could you be aiming? could he be aiming? could we be aiming? could you be aiming? could they be aiming?
Perfect
could I have aimed? could you have aimed? could he have aimed? could we have aimed? could you have aimed? could they have aimed?
V-ing perfect
could I have been aiming? could you have been aiming? could he have been aiming? could we have been aiming? could you have been aiming? could they have been aiming?
Interro-negative form
Simple form
could I not aim? could you not aim? could he not aim? could we not aim? could you not aim? could they not aim?
V-ing form
could I not be aiming? could you not be aiming? could he not be aiming? could we not be aiming? could you not be aiming? could they not be aiming?
Perfect
could I not have aimed? could you not have aimed? could he not have aimed? could we not have aimed? could you not have aimed? could they not have aimed?
V-ing perfect
could I not have been aiming? could you not have been aiming? could he not have been aiming? could we not have been aiming? could you not have been aiming? could they not have been aiming?