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