I could shrivel you could shrivel she could shrivel we could shrivel you could shrivel they could shrivel
V-ing form
I could be shrivelling you could be shrivelling she could be shrivelling we could be shrivelling you could be shrivelling they could be shrivelling
Perfect
I could have shrivelled you could have shrivelled she could have shrivelled we could have shrivelled you could have shrivelled they could have shrivelled
V-ing perfect
I could have been shrivelling you could have been shrivelling she could have been shrivelling we could have been shrivelling you could have been shrivelling they could have been shrivelling
Negation
Simple form
I could not shrivel you could not shrivel she could not shrivel we could not shrivel you could not shrivel they could not shrivel
V-ing form
I could not be shrivelling you could not be shrivelling she could not be shrivelling we could not be shrivelling you could not be shrivelling they could not be shrivelling
Perfect
I could not have shrivelled you could not have shrivelled she could not have shrivelled we could not have shrivelled you could not have shrivelled they could not have shrivelled
V-ing perfect
I could not have been shrivelling you could not have been shrivelling she could not have been shrivelling we could not have been shrivelling you could not have been shrivelling they could not have been shrivelling
Interrogative form
Simple form
could I shrivel? could you shrivel? could she shrivel? could we shrivel? could you shrivel? could they shrivel?
V-ing form
could I be shrivelling? could you be shrivelling? could she be shrivelling? could we be shrivelling? could you be shrivelling? could they be shrivelling?
Perfect
could I have shrivelled? could you have shrivelled? could she have shrivelled? could we have shrivelled? could you have shrivelled? could they have shrivelled?
V-ing perfect
could I have been shrivelling? could you have been shrivelling? could she have been shrivelling? could we have been shrivelling? could you have been shrivelling? could they have been shrivelling?
Interro-negative form
Simple form
could I not shrivel? could you not shrivel? could she not shrivel? could we not shrivel? could you not shrivel? could they not shrivel?
V-ing form
could I not be shrivelling? could you not be shrivelling? could she not be shrivelling? could we not be shrivelling? could you not be shrivelling? could they not be shrivelling?
Perfect
could I not have shrivelled? could you not have shrivelled? could she not have shrivelled? could we not have shrivelled? could you not have shrivelled? could they not have shrivelled?
V-ing perfect
could I not have been shrivelling? could you not have been shrivelling? could she not have been shrivelling? could we not have been shrivelling? could you not have been shrivelling? could they not have been shrivelling?