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