can head
Verbo regular: head - headed- headed

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

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

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

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