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