I'd be sneaking you'd be sneaking she'd be sneaking we'd be sneaking you'd be sneaking they'd be sneaking
Perfect
I should've snuck you should've snuck she 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 she 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 she 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 she 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 she 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 she 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 she sneak? should we sneak? should you sneak? should they sneak?
V-ing form
should I be sneaking? should you be sneaking? should she be sneaking? should we be sneaking? should you be sneaking? should they be sneaking?
Perfect
should I have snuck? should you have snuck? should she 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 she 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 she 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 she 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 she 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 she have been sneaking? shouldn't we have been sneaking? shouldn't you have been sneaking? shouldn't they have been sneaking?