English verb conjugation
COULD LETTER LETTER

Regular verb: letter letter - letter lettered - letter lettered

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could letter letter you could letter letter he could letter letter we could letter letter you could letter letter they could letter letter	I could be letter lettering you could be letter lettering he could be letter lettering we could be letter lettering you could be letter lettering they could be letter lettering
Perfect	V-ing perfect
I could have letter lettered you could have letter lettered he could have letter lettered we could have letter lettered you could have letter lettered they could have letter lettered	I could have been letter lettering you could have been letter lettering he could have been letter lettering we could have been letter lettering you could have been letter lettering they could have been letter lettering

Negation

Simple form	V-ing form
I could not letter letter you could not letter letter he could not letter letter we could not letter letter you could not letter letter they could not letter letter	I could not be letter lettering you could not be letter lettering he could not be letter lettering we could not be letter lettering you could not be letter lettering they could not be letter lettering
Perfect	V-ing perfect
I could not have letter lettered you could not have letter lettered he could not have letter lettered we could not have letter lettered you could not have letter lettered they could not have letter lettered	I could not have been letter lettering you could not have been letter lettering he could not have been letter lettering we could not have been letter lettering you could not have been letter lettering they could not have been letter lettering

Interrogative form

Simple form	V-ing form
could I letter letter? could you letter letter? could he letter letter? could we letter letter? could you letter letter? could they letter letter?	could I be letter lettering? could you be letter lettering? could he be letter lettering? could we be letter lettering? could you be letter lettering? could they be letter lettering?
Perfect	V-ing perfect
could I have letter lettered? could you have letter lettered? could he have letter lettered? could we have letter lettered? could you have letter lettered? could they have letter lettered?	could I have been letter lettering? could you have been letter lettering? could he have been letter lettering? could we have been letter lettering? could you have been letter lettering? could they have been letter lettering?

Interro-negative form

Simple form	V-ing form
could I not letter letter? could you not letter letter? could he not letter letter? could we not letter letter? could you not letter letter? could they not letter letter?	could I not be letter lettering? could you not be letter lettering? could he not be letter lettering? could we not be letter lettering? could you not be letter lettering? could they not be letter lettering?
Perfect	V-ing perfect
could I not have letter lettered? could you not have letter lettered? could he not have letter lettered? could we not have letter lettered? could you not have letter lettered? could they not have letter lettered?	could I not have been letter lettering? could you not have been letter lettering? could he not have been letter lettering? could we not have been letter lettering? could you not have been letter lettering? could they not have been letter lettering?