I could crunch you could crunch he could crunch we could crunch you could crunch they could crunch
V-ing form
I could be crunching you could be crunching he could be crunching we could be crunching you could be crunching they could be crunching
Perfect
I could have crunched you could have crunched he could have crunched we could have crunched you could have crunched they could have crunched
V-ing perfect
I could have been crunching you could have been crunching he could have been crunching we could have been crunching you could have been crunching they could have been crunching
Negation
Simple form
I could not crunch you could not crunch he could not crunch we could not crunch you could not crunch they could not crunch
V-ing form
I could not be crunching you could not be crunching he could not be crunching we could not be crunching you could not be crunching they could not be crunching
Perfect
I could not have crunched you could not have crunched he could not have crunched we could not have crunched you could not have crunched they could not have crunched
V-ing perfect
I could not have been crunching you could not have been crunching he could not have been crunching we could not have been crunching you could not have been crunching they could not have been crunching
Interrogative form
Simple form
could I crunch? could you crunch? could he crunch? could we crunch? could you crunch? could they crunch?
V-ing form
could I be crunching? could you be crunching? could he be crunching? could we be crunching? could you be crunching? could they be crunching?
Perfect
could I have crunched? could you have crunched? could he have crunched? could we have crunched? could you have crunched? could they have crunched?
V-ing perfect
could I have been crunching? could you have been crunching? could he have been crunching? could we have been crunching? could you have been crunching? could they have been crunching?
Interro-negative form
Simple form
could I not crunch? could you not crunch? could he not crunch? could we not crunch? could you not crunch? could they not crunch?
V-ing form
could I not be crunching? could you not be crunching? could he not be crunching? could we not be crunching? could you not be crunching? could they not be crunching?
Perfect
could I not have crunched? could you not have crunched? could he not have crunched? could we not have crunched? could you not have crunched? could they not have crunched?
V-ing perfect
could I not have been crunching? could you not have been crunching? could he not have been crunching? could we not have been crunching? could you not have been crunching? could they not have been crunching?