could glow
Regular verb: glow - glowed- glowed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could glow
you could glow
she could glow
we could glow
you could glow
they could glow 	I could be glowing
you could be glowing
she could be glowing
we could be glowing
you could be glowing
they could be glowing	I could have glowed
you could have glowed
she 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
she 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 couldn't glow
you couldn't glow
she couldn't glow
we couldn't glow
you couldn't glow
they couldn't glow 	I couldn't be glowing
you couldn't be glowing
she couldn't be glowing
we couldn't be glowing
you couldn't be glowing
they couldn't be glowing	I couldn't have glowed
you couldn't have glowed
she couldn't have glowed
we couldn't have glowed
you couldn't have glowed
they couldn't have glowed	I couldn't have been glowing
you couldn't have been glowing
she couldn't have been glowing
we couldn't have been glowing
you couldn't have been glowing
they couldn't have been glowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I glow?
could you glow?
could she glow?
could we glow?
could you glow?
could they glow? 	could I be glowing?
could you be glowing?
could she be glowing?
could we be glowing?
could you be glowing?
could they be glowing? 	could I have glowed?
could you have glowed?
could she 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 she 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 	
couldn't I glow?
couldn't you glow?
couldn't she glow?
couldn't we glow?
couldn't you glow?
couldn't they glow? 	couldn't I be glowing?
couldn't you be glowing?
couldn't she be glowing?
couldn't we be glowing?
couldn't you be glowing?
couldn't they be glowing? 	couldn't I have glowed?
couldn't you have glowed?
couldn't she have glowed?
couldn't we have glowed?
couldn't you have glowed?
couldn't they have glowed? 	couldn't I have been glowing?
couldn't you have been glowing?
couldn't she have been glowing?
couldn't we have been glowing?
couldn't you have been glowing?
couldn't they have been glowing?