I can cower you can cower she can cower we can cower you can cower they can cower
V-ing form
I can be cowering you can be cowering she can be cowering we can be cowering you can be cowering they can be cowering
Perfect
I can have cowered you can have cowered she 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 she can have been cowering we can have been cowering you can have been cowering they can have been cowering
Negation
Simple form
I cannot cower you cannot cower she cannot cower we cannot cower you cannot cower they cannot cower
V-ing form
I cannot be cowering you cannot be cowering she cannot be cowering we cannot be cowering you cannot be cowering they cannot be cowering
Perfect
I cannot have cowered you cannot have cowered she cannot have cowered we cannot have cowered you cannot have cowered they cannot have cowered
V-ing perfect
I cannot have been cowering you cannot have been cowering she cannot have been cowering we cannot have been cowering you cannot have been cowering they cannot have been cowering
Interrogative form
Simple form
can I cower? can you cower? can she cower? can we cower? can you cower? can they cower?
V-ing form
can I be cowering? can you be cowering? can she be cowering? can we be cowering? can you be cowering? can they be cowering?
Perfect
can I have cowered? can you have cowered? can she 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 she have been cowering? can we have been cowering? can you have been cowering? can they have been cowering?
Interro-negative form
Simple form
can I not cower? can you not cower? can she not cower? can we not cower? can you not cower? can they not cower?
V-ing form
can I not be cowering? can you not be cowering? can she not be cowering? can we not be cowering? can you not be cowering? can they not be cowering?
Perfect
can I not have cowered? can you not have cowered? can she not have cowered? can we not have cowered? can you not have cowered? can they not have cowered?
V-ing perfect
can I not have been cowering? can you not have been cowering? can she not have been cowering? can we not have been cowering? can you not have been cowering? can they not have been cowering?