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