I could experience you could experience he could experience we could experience you could experience they could experience
V-ing form
I could be experiencing you could be experiencing he could be experiencing we could be experiencing you could be experiencing they could be experiencing
Perfect
I could have experienced you could have experienced he could have experienced we could have experienced you could have experienced they could have experienced
V-ing perfect
I could have been experiencing you could have been experiencing he could have been experiencing we could have been experiencing you could have been experiencing they could have been experiencing
Negation
Simple form
I could not experience you could not experience he could not experience we could not experience you could not experience they could not experience
V-ing form
I could not be experiencing you could not be experiencing he could not be experiencing we could not be experiencing you could not be experiencing they could not be experiencing
Perfect
I could not have experienced you could not have experienced he could not have experienced we could not have experienced you could not have experienced they could not have experienced
V-ing perfect
I could not have been experiencing you could not have been experiencing he could not have been experiencing we could not have been experiencing you could not have been experiencing they could not have been experiencing
Interrogative form
Simple form
could I experience? could you experience? could he experience? could we experience? could you experience? could they experience?
V-ing form
could I be experiencing? could you be experiencing? could he be experiencing? could we be experiencing? could you be experiencing? could they be experiencing?
Perfect
could I have experienced? could you have experienced? could he have experienced? could we have experienced? could you have experienced? could they have experienced?
V-ing perfect
could I have been experiencing? could you have been experiencing? could he have been experiencing? could we have been experiencing? could you have been experiencing? could they have been experiencing?
Interro-negative form
Simple form
could I not experience? could you not experience? could he not experience? could we not experience? could you not experience? could they not experience?
V-ing form
could I not be experiencing? could you not be experiencing? could he not be experiencing? could we not be experiencing? could you not be experiencing? could they not be experiencing?
Perfect
could I not have experienced? could you not have experienced? could he not have experienced? could we not have experienced? could you not have experienced? could they not have experienced?
V-ing perfect
could I not have been experiencing? could you not have been experiencing? could he not have been experiencing? could we not have been experiencing? could you not have been experiencing? could they not have been experiencing?