could glisten
Regular verb: glisten - glistened- glistened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could glisten
you could glisten
he could glisten
we could glisten
you could glisten
they could glisten 	I could be glistening
you could be glistening
he could be glistening
we could be glistening
you could be glistening
they could be glistening	I could have glistened
you could have glistened
he could have glistened
we could have glistened
you could have glistened
they could have glistened	I could have been glistening
you could have been glistening
he could have been glistening
we could have been glistening
you could have been glistening
they could have been glistening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't glisten
you couldn't glisten
he couldn't glisten
we couldn't glisten
you couldn't glisten
they couldn't glisten 	I couldn't be glistening
you couldn't be glistening
he couldn't be glistening
we couldn't be glistening
you couldn't be glistening
they couldn't be glistening	I couldn't have glistened
you couldn't have glistened
he couldn't have glistened
we couldn't have glistened
you couldn't have glistened
they couldn't have glistened	I couldn't have been glistening
you couldn't have been glistening
he couldn't have been glistening
we couldn't have been glistening
you couldn't have been glistening
they couldn't have been glistening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I glisten?
could you glisten?
could he glisten?
could we glisten?
could you glisten?
could they glisten? 	could I be glistening?
could you be glistening?
could he be glistening?
could we be glistening?
could you be glistening?
could they be glistening? 	could I have glistened?
could you have glistened?
could he have glistened?
could we have glistened?
could you have glistened?
could they have glistened? 	could I have been glistening?
could you have been glistening?
could he have been glistening?
could we have been glistening?
could you have been glistening?
could they have been glistening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I glisten?
couldn't you glisten?
couldn't he glisten?
couldn't we glisten?
couldn't you glisten?
couldn't they glisten? 	couldn't I be glistening?
couldn't you be glistening?
couldn't he be glistening?
couldn't we be glistening?
couldn't you be glistening?
couldn't they be glistening? 	couldn't I have glistened?
couldn't you have glistened?
couldn't he have glistened?
couldn't we have glistened?
couldn't you have glistened?
couldn't they have glistened? 	couldn't I have been glistening?
couldn't you have been glistening?
couldn't he have been glistening?
couldn't we have been glistening?
couldn't you have been glistening?
couldn't they have been glistening?