could expand
Verbo regular: expand - expanded- expanded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not expand
you could not expand
he could not expand
we could not expand
you could not expand
they could not expand 	I could not be expanding
you could not be expanding
he could not be expanding
we could not be expanding
you could not be expanding
they could not be expanding	I could not have expanded
you could not have expanded
he could not have expanded
we could not have expanded
you could not have expanded
they could not have expanded	I could not have been expanding
you could not have been expanding
he could not have been expanding
we could not have been expanding
you could not have been expanding
they could not have been expanding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not expand?
could you not expand?
could he not expand?
could we not expand?
could you not expand?
could they not expand? 	could I not be expanding?
could you not be expanding?
could he not be expanding?
could we not be expanding?
could you not be expanding?
could they not be expanding? 	could I not have expanded?
could you not have expanded?
could he not have expanded?
could we not have expanded?
could you not have expanded?
could they not have expanded? 	could I not have been expanding?
could you not have been expanding?
could he not have been expanding?
could we not have been expanding?
could you not have been expanding?
could they not have been expanding?