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 can't forewarn you can't forewarn he can't forewarn we can't forewarn you can't forewarn they can't forewarn	I can't be forewarning you can't be forewarning he can't be forewarning we can't be forewarning you can't be forewarning they can't be forewarning
Perfect	V-ing perfect
I can't have forewarned you can't have forewarned he can't have forewarned we can't have forewarned you can't have forewarned they can't have forewarned	I can't have been forewarning you can't have been forewarning he can't have been forewarning we can't have been forewarning you can't have been forewarning they can't 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't I forewarn? can't you forewarn? can't he forewarn? can't we forewarn? can't you forewarn? can't they forewarn?	can't I be forewarning? can't you be forewarning? can't he be forewarning? can't we be forewarning? can't you be forewarning? can't they be forewarning?
Perfect	V-ing perfect
can't I have forewarned? can't you have forewarned? can't he have forewarned? can't we have forewarned? can't you have forewarned? can't they have forewarned?	can't I have been forewarning? can't you have been forewarning? can't he have been forewarning? can't we have been forewarning? can't you have been forewarning? can't they have been forewarning?