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