I could aim you could aim she could aim we could aim you could aim they could aim
V-ing form
I could be aiming you could be aiming she could be aiming we could be aiming you could be aiming they could be aiming
Perfect
I could have aimed you could have aimed she 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 she could have been aiming we could have been aiming you could have been aiming they could have been aiming
Negation
Simple form
I couldn't aim you couldn't aim she couldn't aim we couldn't aim you couldn't aim they couldn't aim
V-ing form
I couldn't be aiming you couldn't be aiming she couldn't be aiming we couldn't be aiming you couldn't be aiming they couldn't be aiming
Perfect
I couldn't have aimed you couldn't have aimed she couldn't have aimed we couldn't have aimed you couldn't have aimed they couldn't have aimed
V-ing perfect
I couldn't have been aiming you couldn't have been aiming she couldn't have been aiming we couldn't have been aiming you couldn't have been aiming they couldn't have been aiming
Interrogative form
Simple form
could I aim? could you aim? could she aim? could we aim? could you aim? could they aim?
V-ing form
could I be aiming? could you be aiming? could she be aiming? could we be aiming? could you be aiming? could they be aiming?
Perfect
could I have aimed? could you have aimed? could she 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 she have been aiming? could we have been aiming? could you have been aiming? could they have been aiming?
Interro-negative form
Simple form
couldn't I aim? couldn't you aim? couldn't she aim? couldn't we aim? couldn't you aim? couldn't they aim?
V-ing form
couldn't I be aiming? couldn't you be aiming? couldn't she be aiming? couldn't we be aiming? couldn't you be aiming? couldn't they be aiming?
Perfect
couldn't I have aimed? couldn't you have aimed? couldn't she have aimed? couldn't we have aimed? couldn't you have aimed? couldn't they have aimed?
V-ing perfect
couldn't I have been aiming? couldn't you have been aiming? couldn't she have been aiming? couldn't we have been aiming? couldn't you have been aiming? couldn't they have been aiming?