must double
Verbo regular: double - doubled- doubled

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

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not double
you must not double
he must not double
we must not double
you must not double
they must not double 	I must not be doubling
you must not be doubling
he must not be doubling
we must not be doubling
you must not be doubling
they must not be doubling	I must not have doubled
you must not have doubled
he must not have doubled
we must not have doubled
you must not have doubled
they must not have doubled	I must not have been doubling
you must not have been doubling
he must not have been doubling
we must not have been doubling
you must not have been doubling
they must not have been doubling	

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

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