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