I can chew you can chew he can chew we can chew you can chew they can chew
V-ing form
I can be chewing you can be chewing he can be chewing we can be chewing you can be chewing they can be chewing
Perfect
I can have chewed you can have chewed he can have chewed we can have chewed you can have chewed they can have chewed
V-ing perfect
I can have been chewing you can have been chewing he can have been chewing we can have been chewing you can have been chewing they can have been chewing
Negation
Simple form
I can't chew you can't chew he can't chew we can't chew you can't chew they can't chew
V-ing form
I can't be chewing you can't be chewing he can't be chewing we can't be chewing you can't be chewing they can't be chewing
Perfect
I can't have chewed you can't have chewed he can't have chewed we can't have chewed you can't have chewed they can't have chewed
V-ing perfect
I can't have been chewing you can't have been chewing he can't have been chewing we can't have been chewing you can't have been chewing they can't have been chewing
Interrogative form
Simple form
can I chew? can you chew? can he chew? can we chew? can you chew? can they chew?
V-ing form
can I be chewing? can you be chewing? can he be chewing? can we be chewing? can you be chewing? can they be chewing?
Perfect
can I have chewed? can you have chewed? can he have chewed? can we have chewed? can you have chewed? can they have chewed?
V-ing perfect
can I have been chewing? can you have been chewing? can he have been chewing? can we have been chewing? can you have been chewing? can they have been chewing?
Interro-negative form
Simple form
can't I chew? can't you chew? can't he chew? can't we chew? can't you chew? can't they chew?
V-ing form
can't I be chewing? can't you be chewing? can't he be chewing? can't we be chewing? can't you be chewing? can't they be chewing?
Perfect
can't I have chewed? can't you have chewed? can't he have chewed? can't we have chewed? can't you have chewed? can't they have chewed?
V-ing perfect
can't I have been chewing? can't you have been chewing? can't he have been chewing? can't we have been chewing? can't you have been chewing? can't they have been chewing?