I can camp you can camp he can camp we can camp you can camp they can camp
V-ing form
I can be camping you can be camping he can be camping we can be camping you can be camping they can be camping
Perfect
I can have camped you can have camped he can have camped we can have camped you can have camped they can have camped
V-ing perfect
I can have been camping you can have been camping he can have been camping we can have been camping you can have been camping they can have been camping
Negation
Simple form
I can't camp you can't camp he can't camp we can't camp you can't camp they can't camp
V-ing form
I can't be camping you can't be camping he can't be camping we can't be camping you can't be camping they can't be camping
Perfect
I can't have camped you can't have camped he can't have camped we can't have camped you can't have camped they can't have camped
V-ing perfect
I can't have been camping you can't have been camping he can't have been camping we can't have been camping you can't have been camping they can't have been camping
Interrogative form
Simple form
can I camp? can you camp? can he camp? can we camp? can you camp? can they camp?
V-ing form
can I be camping? can you be camping? can he be camping? can we be camping? can you be camping? can they be camping?
Perfect
can I have camped? can you have camped? can he have camped? can we have camped? can you have camped? can they have camped?
V-ing perfect
can I have been camping? can you have been camping? can he have been camping? can we have been camping? can you have been camping? can they have been camping?
Interro-negative form
Simple form
can't I camp? can't you camp? can't he camp? can't we camp? can't you camp? can't they camp?
V-ing form
can't I be camping? can't you be camping? can't he be camping? can't we be camping? can't you be camping? can't they be camping?
Perfect
can't I have camped? can't you have camped? can't he have camped? can't we have camped? can't you have camped? can't they have camped?
V-ing perfect
can't I have been camping? can't you have been camping? can't he have been camping? can't we have been camping? can't you have been camping? can't they have been camping?