I can barrack you can barrack he can barrack we can barrack you can barrack they can barrack
V-ing form
I can be barracking you can be barracking he can be barracking we can be barracking you can be barracking they can be barracking
Perfect
I can have barracked you can have barracked he can have barracked we can have barracked you can have barracked they can have barracked
V-ing perfect
I can have been barracking you can have been barracking he can have been barracking we can have been barracking you can have been barracking they can have been barracking
Negation
Simple form
I can't barrack you can't barrack he can't barrack we can't barrack you can't barrack they can't barrack
V-ing form
I can't be barracking you can't be barracking he can't be barracking we can't be barracking you can't be barracking they can't be barracking
Perfect
I can't have barracked you can't have barracked he can't have barracked we can't have barracked you can't have barracked they can't have barracked
V-ing perfect
I can't have been barracking you can't have been barracking he can't have been barracking we can't have been barracking you can't have been barracking they can't have been barracking
Interrogative form
Simple form
can I barrack? can you barrack? can he barrack? can we barrack? can you barrack? can they barrack?
V-ing form
can I be barracking? can you be barracking? can he be barracking? can we be barracking? can you be barracking? can they be barracking?
Perfect
can I have barracked? can you have barracked? can he have barracked? can we have barracked? can you have barracked? can they have barracked?
V-ing perfect
can I have been barracking? can you have been barracking? can he have been barracking? can we have been barracking? can you have been barracking? can they have been barracking?
Interro-negative form
Simple form
can't I barrack? can't you barrack? can't he barrack? can't we barrack? can't you barrack? can't they barrack?
V-ing form
can't I be barracking? can't you be barracking? can't he be barracking? can't we be barracking? can't you be barracking? can't they be barracking?
Perfect
can't I have barracked? can't you have barracked? can't he have barracked? can't we have barracked? can't you have barracked? can't they have barracked?
V-ing perfect
can't I have been barracking? can't you have been barracking? can't he have been barracking? can't we have been barracking? can't you have been barracking? can't they have been barracking?