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