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 can't crunch you can't crunch he can't crunch we can't crunch you can't crunch they can't crunch
V-ing form
I can't be crunching you can't be crunching he can't be crunching we can't be crunching you can't be crunching they can't be crunching
Perfect
I can't have crunched you can't have crunched he can't have crunched we can't have crunched you can't have crunched they can't have crunched
V-ing perfect
I can't have been crunching you can't have been crunching he can't have been crunching we can't have been crunching you can't have been crunching they can't 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't I crunch? can't you crunch? can't he crunch? can't we crunch? can't you crunch? can't they crunch?
V-ing form
can't I be crunching? can't you be crunching? can't he be crunching? can't we be crunching? can't you be crunching? can't they be crunching?
Perfect
can't I have crunched? can't you have crunched? can't he have crunched? can't we have crunched? can't you have crunched? can't they have crunched?
V-ing perfect
can't I have been crunching? can't you have been crunching? can't he have been crunching? can't we have been crunching? can't you have been crunching? can't they have been crunching?