could stain
Verbo regolare: stain - stained- stained

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could stain
you could stain
he could stain
we could stain
you could stain
they could stain 	I could be staining
you could be staining
he could be staining
we could be staining
you could be staining
they could be staining	I could have stained
you could have stained
he could have stained
we could have stained
you could have stained
they could have stained	I could have been staining
you could have been staining
he could have been staining
we could have been staining
you could have been staining
they could have been staining	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I couldn't stain
you couldn't stain
he couldn't stain
we couldn't stain
you couldn't stain
they couldn't stain 	I couldn't be staining
you couldn't be staining
he couldn't be staining
we couldn't be staining
you couldn't be staining
they couldn't be staining	I couldn't have stained
you couldn't have stained
he couldn't have stained
we couldn't have stained
you couldn't have stained
they couldn't have stained	I couldn't have been staining
you couldn't have been staining
he couldn't have been staining
we couldn't have been staining
you couldn't have been staining
they couldn't have been staining	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I stain?
could you stain?
could he stain?
could we stain?
could you stain?
could they stain? 	could I be staining?
could you be staining?
could he be staining?
could we be staining?
could you be staining?
could they be staining? 	could I have stained?
could you have stained?
could he have stained?
could we have stained?
could you have stained?
could they have stained? 	could I have been staining?
could you have been staining?
could he have been staining?
could we have been staining?
could you have been staining?
could they have been staining? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
couldn't I stain?
couldn't you stain?
couldn't he stain?
couldn't we stain?
couldn't you stain?
couldn't they stain? 	couldn't I be staining?
couldn't you be staining?
couldn't he be staining?
couldn't we be staining?
couldn't you be staining?
couldn't they be staining? 	couldn't I have stained?
couldn't you have stained?
couldn't he have stained?
couldn't we have stained?
couldn't you have stained?
couldn't they have stained? 	couldn't I have been staining?
couldn't you have been staining?
couldn't he have been staining?
couldn't we have been staining?
couldn't you have been staining?
couldn't they have been staining?