could single-space
Verbo regular: single-space - single-spaced- single-spaced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could single-space
you could single-space
he could single-space
we could single-space
you could single-space
they could single-space 	I could be single-spacing
you could be single-spacing
he could be single-spacing
we could be single-spacing
you could be single-spacing
they could be single-spacing	I could have single-spaced
you could have single-spaced
he could have single-spaced
we could have single-spaced
you could have single-spaced
they could have single-spaced	I could have been single-spacing
you could have been single-spacing
he could have been single-spacing
we could have been single-spacing
you could have been single-spacing
they could have been single-spacing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't single-space
you couldn't single-space
he couldn't single-space
we couldn't single-space
you couldn't single-space
they couldn't single-space 	I couldn't be single-spacing
you couldn't be single-spacing
he couldn't be single-spacing
we couldn't be single-spacing
you couldn't be single-spacing
they couldn't be single-spacing	I couldn't have single-spaced
you couldn't have single-spaced
he couldn't have single-spaced
we couldn't have single-spaced
you couldn't have single-spaced
they couldn't have single-spaced	I couldn't have been single-spacing
you couldn't have been single-spacing
he couldn't have been single-spacing
we couldn't have been single-spacing
you couldn't have been single-spacing
they couldn't have been single-spacing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I single-space?
could you single-space?
could he single-space?
could we single-space?
could you single-space?
could they single-space? 	could I be single-spacing?
could you be single-spacing?
could he be single-spacing?
could we be single-spacing?
could you be single-spacing?
could they be single-spacing? 	could I have single-spaced?
could you have single-spaced?
could he have single-spaced?
could we have single-spaced?
could you have single-spaced?
could they have single-spaced? 	could I have been single-spacing?
could you have been single-spacing?
could he have been single-spacing?
could we have been single-spacing?
could you have been single-spacing?
could they have been single-spacing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I single-space?
couldn't you single-space?
couldn't he single-space?
couldn't we single-space?
couldn't you single-space?
couldn't they single-space? 	couldn't I be single-spacing?
couldn't you be single-spacing?
couldn't he be single-spacing?
couldn't we be single-spacing?
couldn't you be single-spacing?
couldn't they be single-spacing? 	couldn't I have single-spaced?
couldn't you have single-spaced?
couldn't he have single-spaced?
couldn't we have single-spaced?
couldn't you have single-spaced?
couldn't they have single-spaced? 	couldn't I have been single-spacing?
couldn't you have been single-spacing?
couldn't he have been single-spacing?
couldn't we have been single-spacing?
couldn't you have been single-spacing?
couldn't they have been single-spacing?