I'd be sneaking you'd be sneaking he'd be sneaking we'd be sneaking you'd be sneaking they'd be sneaking
Perfect
I should've snuck you should've snuck he should've snuck we should've snuck you should've snuck they should've snuck
V-ing perfect
I should've been sneaking you should've been sneaking he should've been sneaking we should've been sneaking you should've been sneaking they should've been sneaking
Negation
Simple form
I shouldn't sneak you shouldn't sneak he shouldn't sneak we shouldn't sneak you shouldn't sneak they shouldn't sneak
V-ing form
I shouldn't be sneaking you shouldn't be sneaking he shouldn't be sneaking we shouldn't be sneaking you shouldn't be sneaking they shouldn't be sneaking
Perfect
I shouldn't have snuck you shouldn't have snuck he shouldn't have snuck we shouldn't have snuck you shouldn't have snuck they shouldn't have snuck
V-ing perfect
I shouldn't have been sneaking you shouldn't have been sneaking he shouldn't have been sneaking we shouldn't have been sneaking you shouldn't have been sneaking they shouldn't have been sneaking
Interrogative form
Simple form
should I sneak? should you sneak? should he sneak? should we sneak? should you sneak? should they sneak?
V-ing form
should I be sneaking? should you be sneaking? should he be sneaking? should we be sneaking? should you be sneaking? should they be sneaking?
Perfect
should I have snuck? should you have snuck? should he have snuck? should we have snuck? should you have snuck? should they have snuck?
V-ing perfect
should I have been sneaking? should you have been sneaking? should he have been sneaking? should we have been sneaking? should you have been sneaking? should they have been sneaking?
Interro-negative form
Simple form
shouldn't I sneak? shouldn't you sneak? shouldn't he sneak? shouldn't we sneak? shouldn't you sneak? shouldn't they sneak?
V-ing form
shouldn't I be sneaking? shouldn't you be sneaking? shouldn't he be sneaking? shouldn't we be sneaking? shouldn't you be sneaking? shouldn't they be sneaking?
Perfect
shouldn't I have snuck? shouldn't you have snuck? shouldn't he have snuck? shouldn't we have snuck? shouldn't you have snuck? shouldn't they have snuck?
V-ing perfect
shouldn't I have been sneaking? shouldn't you have been sneaking? shouldn't he have been sneaking? shouldn't we have been sneaking? shouldn't you have been sneaking? shouldn't they have been sneaking?