could glower
Regular verb: glower - glowered- glowered

Affirmation 	
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I could glower
you could glower
she could glower
we could glower
you could glower
they could glower 	I could be glowering
you could be glowering
she could be glowering
we could be glowering
you could be glowering
they could be glowering	I could have glowered
you could have glowered
she could have glowered
we could have glowered
you could have glowered
they could have glowered	I could have been glowering
you could have been glowering
she could have been glowering
we could have been glowering
you could have been glowering
they could have been glowering	

Negation 	
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I could not glower
you could not glower
she could not glower
we could not glower
you could not glower
they could not glower 	I could not be glowering
you could not be glowering
she could not be glowering
we could not be glowering
you could not be glowering
they could not be glowering	I could not have glowered
you could not have glowered
she could not have glowered
we could not have glowered
you could not have glowered
they could not have glowered	I could not have been glowering
you could not have been glowering
she could not have been glowering
we could not have been glowering
you could not have been glowering
they could not have been glowering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I glower?
could you glower?
could she glower?
could we glower?
could you glower?
could they glower? 	could I be glowering?
could you be glowering?
could she be glowering?
could we be glowering?
could you be glowering?
could they be glowering? 	could I have glowered?
could you have glowered?
could she have glowered?
could we have glowered?
could you have glowered?
could they have glowered? 	could I have been glowering?
could you have been glowering?
could she have been glowering?
could we have been glowering?
could you have been glowering?
could they have been glowering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not glower?
could you not glower?
could she not glower?
could we not glower?
could you not glower?
could they not glower? 	could I not be glowering?
could you not be glowering?
could she not be glowering?
could we not be glowering?
could you not be glowering?
could they not be glowering? 	could I not have glowered?
could you not have glowered?
could she not have glowered?
could we not have glowered?
could you not have glowered?
could they not have glowered? 	could I not have been glowering?
could you not have been glowering?
could she not have been glowering?
could we not have been glowering?
could you not have been glowering?
could they not have been glowering?