must double-check
Verbo regular: double-check - double-checked- double-checked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must double-check
you must double-check
he must double-check
we must double-check
you must double-check
they must double-check 	I must be double-checking
you must be double-checking
he must be double-checking
we must be double-checking
you must be double-checking
they must be double-checking	I must have double-checked
you must have double-checked
he must have double-checked
we must have double-checked
you must have double-checked
they must have double-checked	I must have been double-checking
you must have been double-checking
he must have been double-checking
we must have been double-checking
you must have been double-checking
they must have been double-checking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not double-check
you must not double-check
he must not double-check
we must not double-check
you must not double-check
they must not double-check 	I must not be double-checking
you must not be double-checking
he must not be double-checking
we must not be double-checking
you must not be double-checking
they must not be double-checking	I must not have double-checked
you must not have double-checked
he must not have double-checked
we must not have double-checked
you must not have double-checked
they must not have double-checked	I must not have been double-checking
you must not have been double-checking
he must not have been double-checking
we must not have been double-checking
you must not have been double-checking
they must not have been double-checking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I double-check?
must you double-check?
must he double-check?
must we double-check?
must you double-check?
must they double-check? 	must I be double-checking?
must you be double-checking?
must he be double-checking?
must we be double-checking?
must you be double-checking?
must they be double-checking? 	must I have double-checked?
must you have double-checked?
must he have double-checked?
must we have double-checked?
must you have double-checked?
must they have double-checked? 	must I have been double-checking?
must you have been double-checking?
must he have been double-checking?
must we have been double-checking?
must you have been double-checking?
must they have been double-checking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not double-check?
must you not double-check?
must he not double-check?
must we not double-check?
must you not double-check?
must they not double-check? 	must I not be double-checking?
must you not be double-checking?
must he not be double-checking?
must we not be double-checking?
must you not be double-checking?
must they not be double-checking? 	must I not have double-checked?
must you not have double-checked?
must he not have double-checked?
must we not have double-checked?
must you not have double-checked?
must they not have double-checked? 	must I not have been double-checking?
must you not have been double-checking?
must he not have been double-checking?
must we not have been double-checking?
must you not have been double-checking?
must they not have been double-checking?