I could alarm you could alarm she could alarm we could alarm you could alarm they could alarm
V-ing form
I could be alarming you could be alarming she could be alarming we could be alarming you could be alarming they could be alarming
Perfect
I could have alarmed you could have alarmed she could have alarmed we could have alarmed you could have alarmed they could have alarmed
V-ing perfect
I could have been alarming you could have been alarming she could have been alarming we could have been alarming you could have been alarming they could have been alarming
Negation
Simple form
I could not alarm you could not alarm she could not alarm we could not alarm you could not alarm they could not alarm
V-ing form
I could not be alarming you could not be alarming she could not be alarming we could not be alarming you could not be alarming they could not be alarming
Perfect
I could not have alarmed you could not have alarmed she could not have alarmed we could not have alarmed you could not have alarmed they could not have alarmed
V-ing perfect
I could not have been alarming you could not have been alarming she could not have been alarming we could not have been alarming you could not have been alarming they could not have been alarming
Interrogative form
Simple form
could I alarm? could you alarm? could she alarm? could we alarm? could you alarm? could they alarm?
V-ing form
could I be alarming? could you be alarming? could she be alarming? could we be alarming? could you be alarming? could they be alarming?
Perfect
could I have alarmed? could you have alarmed? could she have alarmed? could we have alarmed? could you have alarmed? could they have alarmed?
V-ing perfect
could I have been alarming? could you have been alarming? could she have been alarming? could we have been alarming? could you have been alarming? could they have been alarming?
Interro-negative form
Simple form
could I not alarm? could you not alarm? could she not alarm? could we not alarm? could you not alarm? could they not alarm?
V-ing form
could I not be alarming? could you not be alarming? could she not be alarming? could we not be alarming? could you not be alarming? could they not be alarming?
Perfect
could I not have alarmed? could you not have alarmed? could she not have alarmed? could we not have alarmed? could you not have alarmed? could they not have alarmed?
V-ing perfect
could I not have been alarming? could you not have been alarming? could she not have been alarming? could we not have been alarming? could you not have been alarming? could they not have been alarming?