could quintuple
Verbo regular: quintuple - quintupled- quintupled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could quintuple
you could quintuple
she could quintuple
we could quintuple
you could quintuple
they could quintuple 	I could be quintupling
you could be quintupling
she could be quintupling
we could be quintupling
you could be quintupling
they could be quintupling	I could have quintupled
you could have quintupled
she could have quintupled
we could have quintupled
you could have quintupled
they could have quintupled	I could have been quintupling
you could have been quintupling
she could have been quintupling
we could have been quintupling
you could have been quintupling
they could have been quintupling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not quintuple
you could not quintuple
she could not quintuple
we could not quintuple
you could not quintuple
they could not quintuple 	I could not be quintupling
you could not be quintupling
she could not be quintupling
we could not be quintupling
you could not be quintupling
they could not be quintupling	I could not have quintupled
you could not have quintupled
she could not have quintupled
we could not have quintupled
you could not have quintupled
they could not have quintupled	I could not have been quintupling
you could not have been quintupling
she could not have been quintupling
we could not have been quintupling
you could not have been quintupling
they could not have been quintupling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I quintuple?
could you quintuple?
could she quintuple?
could we quintuple?
could you quintuple?
could they quintuple? 	could I be quintupling?
could you be quintupling?
could she be quintupling?
could we be quintupling?
could you be quintupling?
could they be quintupling? 	could I have quintupled?
could you have quintupled?
could she have quintupled?
could we have quintupled?
could you have quintupled?
could they have quintupled? 	could I have been quintupling?
could you have been quintupling?
could she have been quintupling?
could we have been quintupling?
could you have been quintupling?
could they have been quintupling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not quintuple?
could you not quintuple?
could she not quintuple?
could we not quintuple?
could you not quintuple?
could they not quintuple? 	could I not be quintupling?
could you not be quintupling?
could she not be quintupling?
could we not be quintupling?
could you not be quintupling?
could they not be quintupling? 	could I not have quintupled?
could you not have quintupled?
could she not have quintupled?
could we not have quintupled?
could you not have quintupled?
could they not have quintupled? 	could I not have been quintupling?
could you not have been quintupling?
could she not have been quintupling?
could we not have been quintupling?
could you not have been quintupling?
could they not have been quintupling?