could head
Verbo regular: head - headed- headed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could head
you could head
he could head
we could head
you could head
they could head 	I could be heading
you could be heading
he could be heading
we could be heading
you could be heading
they could be heading	I could have headed
you could have headed
he could have headed
we could have headed
you could have headed
they could have headed	I could have been heading
you could have been heading
he could have been heading
we could have been heading
you could have been heading
they could have been heading	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not head
you could not head
he could not head
we could not head
you could not head
they could not head 	I could not be heading
you could not be heading
he could not be heading
we could not be heading
you could not be heading
they could not be heading	I could not have headed
you could not have headed
he could not have headed
we could not have headed
you could not have headed
they could not have headed	I could not have been heading
you could not have been heading
he could not have been heading
we could not have been heading
you could not have been heading
they could not have been heading	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I head?
could you head?
could he head?
could we head?
could you head?
could they head? 	could I be heading?
could you be heading?
could he be heading?
could we be heading?
could you be heading?
could they be heading? 	could I have headed?
could you have headed?
could he have headed?
could we have headed?
could you have headed?
could they have headed? 	could I have been heading?
could you have been heading?
could he have been heading?
could we have been heading?
could you have been heading?
could they have been heading? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not head?
could you not head?
could he not head?
could we not head?
could you not head?
could they not head? 	could I not be heading?
could you not be heading?
could he not be heading?
could we not be heading?
could you not be heading?
could they not be heading? 	could I not have headed?
could you not have headed?
could he not have headed?
could we not have headed?
could you not have headed?
could they not have headed? 	could I not have been heading?
could you not have been heading?
could he not have been heading?
could we not have been heading?
could you not have been heading?
could they not have been heading?