I could prolapse you could prolapse he could prolapse we could prolapse you could prolapse they could prolapse
V-ing form
I could be prolapsing you could be prolapsing he could be prolapsing we could be prolapsing you could be prolapsing they could be prolapsing
Perfect
I could have prolapsed you could have prolapsed he could have prolapsed we could have prolapsed you could have prolapsed they could have prolapsed
V-ing perfect
I could have been prolapsing you could have been prolapsing he could have been prolapsing we could have been prolapsing you could have been prolapsing they could have been prolapsing
Negation
Simple form
I couldn't prolapse you couldn't prolapse he couldn't prolapse we couldn't prolapse you couldn't prolapse they couldn't prolapse
V-ing form
I couldn't be prolapsing you couldn't be prolapsing he couldn't be prolapsing we couldn't be prolapsing you couldn't be prolapsing they couldn't be prolapsing
Perfect
I couldn't have prolapsed you couldn't have prolapsed he couldn't have prolapsed we couldn't have prolapsed you couldn't have prolapsed they couldn't have prolapsed
V-ing perfect
I couldn't have been prolapsing you couldn't have been prolapsing he couldn't have been prolapsing we couldn't have been prolapsing you couldn't have been prolapsing they couldn't have been prolapsing
Interrogative form
Simple form
could I prolapse? could you prolapse? could he prolapse? could we prolapse? could you prolapse? could they prolapse?
V-ing form
could I be prolapsing? could you be prolapsing? could he be prolapsing? could we be prolapsing? could you be prolapsing? could they be prolapsing?
Perfect
could I have prolapsed? could you have prolapsed? could he have prolapsed? could we have prolapsed? could you have prolapsed? could they have prolapsed?
V-ing perfect
could I have been prolapsing? could you have been prolapsing? could he have been prolapsing? could we have been prolapsing? could you have been prolapsing? could they have been prolapsing?
Interro-negative form
Simple form
couldn't I prolapse? couldn't you prolapse? couldn't he prolapse? couldn't we prolapse? couldn't you prolapse? couldn't they prolapse?
V-ing form
couldn't I be prolapsing? couldn't you be prolapsing? couldn't he be prolapsing? couldn't we be prolapsing? couldn't you be prolapsing? couldn't they be prolapsing?
Perfect
couldn't I have prolapsed? couldn't you have prolapsed? couldn't he have prolapsed? couldn't we have prolapsed? couldn't you have prolapsed? couldn't they have prolapsed?
V-ing perfect
couldn't I have been prolapsing? couldn't you have been prolapsing? couldn't he have been prolapsing? couldn't we have been prolapsing? couldn't you have been prolapsing? couldn't they have been prolapsing?