must head
Verbo regular: head - headed- headed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must head
you must head
he must head
we must head
you must head
they must head 	I must be heading
you must be heading
he must be heading
we must be heading
you must be heading
they must be heading	I must have headed
you must have headed
he must have headed
we must have headed
you must have headed
they must have headed	I must have been heading
you must have been heading
he must have been heading
we must have been heading
you must have been heading
they must have been heading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not head
you must not head
he must not head
we must not head
you must not head
they must not head 	I must not be heading
you must not be heading
he must not be heading
we must not be heading
you must not be heading
they must not be heading	I must not have headed
you must not have headed
he must not have headed
we must not have headed
you must not have headed
they must not have headed	I must not have been heading
you must not have been heading
he must not have been heading
we must not have been heading
you must not have been heading
they must not have been heading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I head?
must you head?
must he head?
must we head?
must you head?
must they head? 	must I be heading?
must you be heading?
must he be heading?
must we be heading?
must you be heading?
must they be heading? 	must I have headed?
must you have headed?
must he have headed?
must we have headed?
must you have headed?
must they have headed? 	must I have been heading?
must you have been heading?
must he have been heading?
must we have been heading?
must you have been heading?
must they have been heading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not head?
must you not head?
must he not head?
must we not head?
must you not head?
must they not head? 	must I not be heading?
must you not be heading?
must he not be heading?
must we not be heading?
must you not be heading?
must they not be heading? 	must I not have headed?
must you not have headed?
must he not have headed?
must we not have headed?
must you not have headed?
must they not have headed? 	must I not have been heading?
must you not have been heading?
must he not have been heading?
must we not have been heading?
must you not have been heading?
must they not have been heading?