I can glower you can glower he can glower we can glower you can glower they can glower
V-ing form
I can be glowering you can be glowering he can be glowering we can be glowering you can be glowering they can be glowering
Perfect
I can have glowered you can have glowered he can have glowered we can have glowered you can have glowered they can have glowered
V-ing perfect
I can have been glowering you can have been glowering he can have been glowering we can have been glowering you can have been glowering they can have been glowering
Negation
Simple form
I cannot glower you cannot glower he cannot glower we cannot glower you cannot glower they cannot glower
V-ing form
I cannot be glowering you cannot be glowering he cannot be glowering we cannot be glowering you cannot be glowering they cannot be glowering
Perfect
I cannot have glowered you cannot have glowered he cannot have glowered we cannot have glowered you cannot have glowered they cannot have glowered
V-ing perfect
I cannot have been glowering you cannot have been glowering he cannot have been glowering we cannot have been glowering you cannot have been glowering they cannot have been glowering
Interrogative form
Simple form
can I glower? can you glower? can he glower? can we glower? can you glower? can they glower?
V-ing form
can I be glowering? can you be glowering? can he be glowering? can we be glowering? can you be glowering? can they be glowering?
Perfect
can I have glowered? can you have glowered? can he have glowered? can we have glowered? can you have glowered? can they have glowered?
V-ing perfect
can I have been glowering? can you have been glowering? can he have been glowering? can we have been glowering? can you have been glowering? can they have been glowering?
Interro-negative form
Simple form
can I not glower? can you not glower? can he not glower? can we not glower? can you not glower? can they not glower?
V-ing form
can I not be glowering? can you not be glowering? can he not be glowering? can we not be glowering? can you not be glowering? can they not be glowering?
Perfect
can I not have glowered? can you not have glowered? can he not have glowered? can we not have glowered? can you not have glowered? can they not have glowered?
V-ing perfect
can I not have been glowering? can you not have been glowering? can he not have been glowering? can we not have been glowering? can you not have been glowering? can they not have been glowering?