I can sneak you can sneak she can sneak we can sneak you can sneak they can sneak
V-ing form
I can be sneaking you can be sneaking she can be sneaking we can be sneaking you can be sneaking they can be sneaking
Perfect
I can have snuck you can have snuck she can have snuck we can have snuck you can have snuck they can have snuck
V-ing perfect
I can have been sneaking you can have been sneaking she can have been sneaking we can have been sneaking you can have been sneaking they can have been sneaking
Negation
Simple form
I can't sneak you can't sneak she can't sneak we can't sneak you can't sneak they can't sneak
V-ing form
I can't be sneaking you can't be sneaking she can't be sneaking we can't be sneaking you can't be sneaking they can't be sneaking
Perfect
I can't have snuck you can't have snuck she can't have snuck we can't have snuck you can't have snuck they can't have snuck
V-ing perfect
I can't have been sneaking you can't have been sneaking she can't have been sneaking we can't have been sneaking you can't have been sneaking they can't have been sneaking
Interrogative form
Simple form
can I sneak? can you sneak? can she sneak? can we sneak? can you sneak? can they sneak?
V-ing form
can I be sneaking? can you be sneaking? can she be sneaking? can we be sneaking? can you be sneaking? can they be sneaking?
Perfect
can I have snuck? can you have snuck? can she have snuck? can we have snuck? can you have snuck? can they have snuck?
V-ing perfect
can I have been sneaking? can you have been sneaking? can she have been sneaking? can we have been sneaking? can you have been sneaking? can they have been sneaking?
Interro-negative form
Simple form
can't I sneak? can't you sneak? can't she sneak? can't we sneak? can't you sneak? can't they sneak?
V-ing form
can't I be sneaking? can't you be sneaking? can't she be sneaking? can't we be sneaking? can't you be sneaking? can't they be sneaking?
Perfect
can't I have snuck? can't you have snuck? can't she have snuck? can't we have snuck? can't you have snuck? can't they have snuck?
V-ing perfect
can't I have been sneaking? can't you have been sneaking? can't she have been sneaking? can't we have been sneaking? can't you have been sneaking? can't they have been sneaking?