English verb conjugation
COULD HEAD

Regular verb: head - headed - headed

Affirmation

Simple form	V-ing form
I could head you could head she could head we could head you could head they could head	I could be heading you could be heading she could be heading we could be heading you could be heading they could be heading
Perfect	V-ing perfect
I could have headed you could have headed she 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 she could have been heading we could have been heading you could have been heading they could have been heading

Negation

Simple form	V-ing form
I could not head you could not head she 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 she could not be heading we could not be heading you could not be heading they could not be heading
Perfect	V-ing perfect
I could not have headed you could not have headed she 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 she could not have been heading we could not have been heading you could not have been heading they could not have been heading

Interrogative form

Simple form	V-ing form
could I head? could you head? could she head? could we head? could you head? could they head?	could I be heading? could you be heading? could she be heading? could we be heading? could you be heading? could they be heading?
Perfect	V-ing perfect
could I have headed? could you have headed? could she 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 she have been heading? could we have been heading? could you have been heading? could they have been heading?

Interro-negative form

Simple form	V-ing form
could I not head? could you not head? could she 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 she not be heading? could we not be heading? could you not be heading? could they not be heading?
Perfect	V-ing perfect
could I not have headed? could you not have headed? could she 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 she not have been heading? could we not have been heading? could you not have been heading? could they not have been heading?