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