could double-glaze
Regular verb: double-glaze - double-glazed- double-glazed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could double-glaze
you could double-glaze
she could double-glaze
we could double-glaze
you could double-glaze
they could double-glaze 	I could be double-glazing
you could be double-glazing
she could be double-glazing
we could be double-glazing
you could be double-glazing
they could be double-glazing	I could have double-glazed
you could have double-glazed
she could have double-glazed
we could have double-glazed
you could have double-glazed
they could have double-glazed	I could have been double-glazing
you could have been double-glazing
she could have been double-glazing
we could have been double-glazing
you could have been double-glazing
they could have been double-glazing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't double-glaze
you couldn't double-glaze
she couldn't double-glaze
we couldn't double-glaze
you couldn't double-glaze
they couldn't double-glaze 	I couldn't be double-glazing
you couldn't be double-glazing
she couldn't be double-glazing
we couldn't be double-glazing
you couldn't be double-glazing
they couldn't be double-glazing	I couldn't have double-glazed
you couldn't have double-glazed
she couldn't have double-glazed
we couldn't have double-glazed
you couldn't have double-glazed
they couldn't have double-glazed	I couldn't have been double-glazing
you couldn't have been double-glazing
she couldn't have been double-glazing
we couldn't have been double-glazing
you couldn't have been double-glazing
they couldn't have been double-glazing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I double-glaze?
could you double-glaze?
could she double-glaze?
could we double-glaze?
could you double-glaze?
could they double-glaze? 	could I be double-glazing?
could you be double-glazing?
could she be double-glazing?
could we be double-glazing?
could you be double-glazing?
could they be double-glazing? 	could I have double-glazed?
could you have double-glazed?
could she have double-glazed?
could we have double-glazed?
could you have double-glazed?
could they have double-glazed? 	could I have been double-glazing?
could you have been double-glazing?
could she have been double-glazing?
could we have been double-glazing?
could you have been double-glazing?
could they have been double-glazing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I double-glaze?
couldn't you double-glaze?
couldn't she double-glaze?
couldn't we double-glaze?
couldn't you double-glaze?
couldn't they double-glaze? 	couldn't I be double-glazing?
couldn't you be double-glazing?
couldn't she be double-glazing?
couldn't we be double-glazing?
couldn't you be double-glazing?
couldn't they be double-glazing? 	couldn't I have double-glazed?
couldn't you have double-glazed?
couldn't she have double-glazed?
couldn't we have double-glazed?
couldn't you have double-glazed?
couldn't they have double-glazed? 	couldn't I have been double-glazing?
couldn't you have been double-glazing?
couldn't she have been double-glazing?
couldn't we have been double-glazing?
couldn't you have been double-glazing?
couldn't they have been double-glazing?