I could prolapse you could prolapse she could prolapse we could prolapse you could prolapse they could prolapse
V-ing form
I could be prolapsing you could be prolapsing she could be prolapsing we could be prolapsing you could be prolapsing they could be prolapsing
Perfect
I could have prolapsed you could have prolapsed she 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 she could have been prolapsing we could have been prolapsing you could have been prolapsing they could have been prolapsing
Negation
Simple form
I could not prolapse you could not prolapse she could not prolapse we could not prolapse you could not prolapse they could not prolapse
V-ing form
I could not be prolapsing you could not be prolapsing she could not be prolapsing we could not be prolapsing you could not be prolapsing they could not be prolapsing
Perfect
I could not have prolapsed you could not have prolapsed she could not have prolapsed we could not have prolapsed you could not have prolapsed they could not have prolapsed
V-ing perfect
I could not have been prolapsing you could not have been prolapsing she could not have been prolapsing we could not have been prolapsing you could not have been prolapsing they could not have been prolapsing
Interrogative form
Simple form
could I prolapse? could you prolapse? could she prolapse? could we prolapse? could you prolapse? could they prolapse?
V-ing form
could I be prolapsing? could you be prolapsing? could she be prolapsing? could we be prolapsing? could you be prolapsing? could they be prolapsing?
Perfect
could I have prolapsed? could you have prolapsed? could she 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 she have been prolapsing? could we have been prolapsing? could you have been prolapsing? could they have been prolapsing?
Interro-negative form
Simple form
could I not prolapse? could you not prolapse? could she not prolapse? could we not prolapse? could you not prolapse? could they not prolapse?
V-ing form
could I not be prolapsing? could you not be prolapsing? could she not be prolapsing? could we not be prolapsing? could you not be prolapsing? could they not be prolapsing?
Perfect
could I not have prolapsed? could you not have prolapsed? could she not have prolapsed? could we not have prolapsed? could you not have prolapsed? could they not have prolapsed?
V-ing perfect
could I not have been prolapsing? could you not have been prolapsing? could she not have been prolapsing? could we not have been prolapsing? could you not have been prolapsing? could they not have been prolapsing?