I can head you can head he can head we can head you can head they can head
Forma con V-ing
I can be heading you can be heading he can be heading we can be heading you can be heading they can be heading
Perfecto
I can have headed you can have headed he can have headed we can have headed you can have headed they can have headed
Perfecto con V-ing
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
I can't head you can't head he can't head we can't head you can't head they can't head
Forma con V-ing
I can't be heading you can't be heading he can't be heading we can't be heading you can't be heading they can't be heading
Perfecto
I can't have headed you can't have headed he can't have headed we can't have headed you can't have headed they can't have headed
Perfecto con V-ing
I can't have been heading you can't have been heading he can't have been heading we can't have been heading you can't have been heading they can't have been heading
Forma interrogativa
Forma simple
can I head? can you head? can he head? can we head? can you head? can they head?
Forma con V-ing
can I be heading? can you be heading? can he be heading? can we be heading? can you be heading? can they be heading?
Perfecto
can I have headed? can you have headed? can he have headed? can we have headed? can you have headed? can they have headed?
Perfecto con V-ing
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
can't I head? can't you head? can't he head? can't we head? can't you head? can't they head?
Forma con V-ing
can't I be heading? can't you be heading? can't he be heading? can't we be heading? can't you be heading? can't they be heading?
Perfecto
can't I have headed? can't you have headed? can't he have headed? can't we have headed? can't you have headed? can't they have headed?
Perfecto con V-ing
can't I have been heading? can't you have been heading? can't he have been heading? can't we have been heading? can't you have been heading? can't they have been heading?