could shade
Verbo regular: shade - shaded- shaded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could shade
you could shade
he could shade
we could shade
you could shade
they could shade 	I could be shading
you could be shading
he could be shading
we could be shading
you could be shading
they could be shading	I could have shaded
you could have shaded
he could have shaded
we could have shaded
you could have shaded
they could have shaded	I could have been shading
you could have been shading
he could have been shading
we could have been shading
you could have been shading
they could have been shading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't shade
you couldn't shade
he couldn't shade
we couldn't shade
you couldn't shade
they couldn't shade 	I couldn't be shading
you couldn't be shading
he couldn't be shading
we couldn't be shading
you couldn't be shading
they couldn't be shading	I couldn't have shaded
you couldn't have shaded
he couldn't have shaded
we couldn't have shaded
you couldn't have shaded
they couldn't have shaded	I couldn't have been shading
you couldn't have been shading
he couldn't have been shading
we couldn't have been shading
you couldn't have been shading
they couldn't have been shading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I shade?
could you shade?
could he shade?
could we shade?
could you shade?
could they shade? 	could I be shading?
could you be shading?
could he be shading?
could we be shading?
could you be shading?
could they be shading? 	could I have shaded?
could you have shaded?
could he have shaded?
could we have shaded?
could you have shaded?
could they have shaded? 	could I have been shading?
could you have been shading?
could he have been shading?
could we have been shading?
could you have been shading?
could they have been shading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I shade?
couldn't you shade?
couldn't he shade?
couldn't we shade?
couldn't you shade?
couldn't they shade? 	couldn't I be shading?
couldn't you be shading?
couldn't he be shading?
couldn't we be shading?
couldn't you be shading?
couldn't they be shading? 	couldn't I have shaded?
couldn't you have shaded?
couldn't he have shaded?
couldn't we have shaded?
couldn't you have shaded?
couldn't they have shaded? 	couldn't I have been shading?
couldn't you have been shading?
couldn't he have been shading?
couldn't we have been shading?
couldn't you have been shading?
couldn't they have been shading?