can double
Verbo regular: double - doubled- doubled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can double
you can double
she can double
we can double
you can double
they can double 	I can be doubling
you can be doubling
she can be doubling
we can be doubling
you can be doubling
they can be doubling	I can have doubled
you can have doubled
she can have doubled
we can have doubled
you can have doubled
they can have doubled	I can have been doubling
you can have been doubling
she can have been doubling
we can have been doubling
you can have been doubling
they can have been doubling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I cannot double
you cannot double
she cannot double
we cannot double
you cannot double
they cannot double 	I cannot be doubling
you cannot be doubling
she cannot be doubling
we cannot be doubling
you cannot be doubling
they cannot be doubling	I cannot have doubled
you cannot have doubled
she cannot have doubled
we cannot have doubled
you cannot have doubled
they cannot have doubled	I cannot have been doubling
you cannot have been doubling
she cannot have been doubling
we cannot have been doubling
you cannot have been doubling
they cannot have been doubling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I double?
can you double?
can she double?
can we double?
can you double?
can they double? 	can I be doubling?
can you be doubling?
can she be doubling?
can we be doubling?
can you be doubling?
can they be doubling? 	can I have doubled?
can you have doubled?
can she have doubled?
can we have doubled?
can you have doubled?
can they have doubled? 	can I have been doubling?
can you have been doubling?
can she have been doubling?
can we have been doubling?
can you have been doubling?
can they have been doubling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I not double?
can you not double?
can she not double?
can we not double?
can you not double?
can they not double? 	can I not be doubling?
can you not be doubling?
can she not be doubling?
can we not be doubling?
can you not be doubling?
can they not be doubling? 	can I not have doubled?
can you not have doubled?
can she not have doubled?
can we not have doubled?
can you not have doubled?
can they not have doubled? 	can I not have been doubling?
can you not have been doubling?
can she not have been doubling?
can we not have been doubling?
can you not have been doubling?
can they not have been doubling?