could expand
Verbo regular: expand - expanded- expanded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could expand
you could expand
he could expand
we could expand
you could expand
they could expand 	I could be expanding
you could be expanding
he could be expanding
we could be expanding
you could be expanding
they could be expanding	I could have expanded
you could have expanded
he could have expanded
we could have expanded
you could have expanded
they could have expanded	I could have been expanding
you could have been expanding
he could have been expanding
we could have been expanding
you could have been expanding
they could have been expanding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't expand
you couldn't expand
he couldn't expand
we couldn't expand
you couldn't expand
they couldn't expand 	I couldn't be expanding
you couldn't be expanding
he couldn't be expanding
we couldn't be expanding
you couldn't be expanding
they couldn't be expanding	I couldn't have expanded
you couldn't have expanded
he couldn't have expanded
we couldn't have expanded
you couldn't have expanded
they couldn't have expanded	I couldn't have been expanding
you couldn't have been expanding
he couldn't have been expanding
we couldn't have been expanding
you couldn't have been expanding
they couldn't have been expanding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I expand?
could you expand?
could he expand?
could we expand?
could you expand?
could they expand? 	could I be expanding?
could you be expanding?
could he be expanding?
could we be expanding?
could you be expanding?
could they be expanding? 	could I have expanded?
could you have expanded?
could he have expanded?
could we have expanded?
could you have expanded?
could they have expanded? 	could I have been expanding?
could you have been expanding?
could he have been expanding?
could we have been expanding?
could you have been expanding?
could they have been expanding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I expand?
couldn't you expand?
couldn't he expand?
couldn't we expand?
couldn't you expand?
couldn't they expand? 	couldn't I be expanding?
couldn't you be expanding?
couldn't he be expanding?
couldn't we be expanding?
couldn't you be expanding?
couldn't they be expanding? 	couldn't I have expanded?
couldn't you have expanded?
couldn't he have expanded?
couldn't we have expanded?
couldn't you have expanded?
couldn't they have expanded? 	couldn't I have been expanding?
couldn't you have been expanding?
couldn't he have been expanding?
couldn't we have been expanding?
couldn't you have been expanding?
couldn't they have been expanding?