could glow
Regular verb: glow - glowed- glowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could glow
you could glow
he could glow
we could glow
you could glow
they could glow 	I could be glowing
you could be glowing
he could be glowing
we could be glowing
you could be glowing
they could be glowing	I could have glowed
you could have glowed
he could have glowed
we could have glowed
you could have glowed
they could have glowed	I could have been glowing
you could have been glowing
he could have been glowing
we could have been glowing
you could have been glowing
they could have been glowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not glow
you could not glow
he could not glow
we could not glow
you could not glow
they could not glow 	I could not be glowing
you could not be glowing
he could not be glowing
we could not be glowing
you could not be glowing
they could not be glowing	I could not have glowed
you could not have glowed
he could not have glowed
we could not have glowed
you could not have glowed
they could not have glowed	I could not have been glowing
you could not have been glowing
he could not have been glowing
we could not have been glowing
you could not have been glowing
they could not have been glowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I glow?
could you glow?
could he glow?
could we glow?
could you glow?
could they glow? 	could I be glowing?
could you be glowing?
could he be glowing?
could we be glowing?
could you be glowing?
could they be glowing? 	could I have glowed?
could you have glowed?
could he have glowed?
could we have glowed?
could you have glowed?
could they have glowed? 	could I have been glowing?
could you have been glowing?
could he have been glowing?
could we have been glowing?
could you have been glowing?
could they have been glowing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not glow?
could you not glow?
could he not glow?
could we not glow?
could you not glow?
could they not glow? 	could I not be glowing?
could you not be glowing?
could he not be glowing?
could we not be glowing?
could you not be glowing?
could they not be glowing? 	could I not have glowed?
could you not have glowed?
could he not have glowed?
could we not have glowed?
could you not have glowed?
could they not have glowed? 	could I not have been glowing?
could you not have been glowing?
could he not have been glowing?
could we not have been glowing?
could you not have been glowing?
could they not have been glowing?