English verb conjugation
COULD FOREWARN

Regular verb: forewarn - forewarned - forewarned

Affirmation

Simple form	V-ing form
I could forewarn you could forewarn he could forewarn we could forewarn you could forewarn they could forewarn	I could be forewarning you could be forewarning he could be forewarning we could be forewarning you could be forewarning they could be forewarning
Perfect	V-ing perfect
I could have forewarned you could have forewarned he could have forewarned we could have forewarned you could have forewarned they could have forewarned	I could have been forewarning you could have been forewarning he could have been forewarning we could have been forewarning you could have been forewarning they could have been forewarning

Negation

Simple form	V-ing form
I could not forewarn you could not forewarn he could not forewarn we could not forewarn you could not forewarn they could not forewarn	I could not be forewarning you could not be forewarning he could not be forewarning we could not be forewarning you could not be forewarning they could not be forewarning
Perfect	V-ing perfect
I could not have forewarned you could not have forewarned he could not have forewarned we could not have forewarned you could not have forewarned they could not have forewarned	I could not have been forewarning you could not have been forewarning he could not have been forewarning we could not have been forewarning you could not have been forewarning they could not have been forewarning

Interrogative form

Simple form	V-ing form
could I forewarn? could you forewarn? could he forewarn? could we forewarn? could you forewarn? could they forewarn?	could I be forewarning? could you be forewarning? could he be forewarning? could we be forewarning? could you be forewarning? could they be forewarning?
Perfect	V-ing perfect
could I have forewarned? could you have forewarned? could he have forewarned? could we have forewarned? could you have forewarned? could they have forewarned?	could I have been forewarning? could you have been forewarning? could he have been forewarning? could we have been forewarning? could you have been forewarning? could they have been forewarning?

Interro-negative form

Simple form	V-ing form
could I not forewarn? could you not forewarn? could he not forewarn? could we not forewarn? could you not forewarn? could they not forewarn?	could I not be forewarning? could you not be forewarning? could he not be forewarning? could we not be forewarning? could you not be forewarning? could they not be forewarning?
Perfect	V-ing perfect
could I not have forewarned? could you not have forewarned? could he not have forewarned? could we not have forewarned? could you not have forewarned? could they not have forewarned?	could I not have been forewarning? could you not have been forewarning? could he not have been forewarning? could we not have been forewarning? could you not have been forewarning? could they not have been forewarning?