English verb conjugation
CAN FOREWARN

Regular verb: forewarn - forewarned - forewarned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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