English verb conjugation
CAN PREWARN

Regular verb: prewarn - prewarned - prewarned

Affirmation

Simple form	V-ing form
I can prewarn you can prewarn she can prewarn we can prewarn you can prewarn they can prewarn	I can be prewarning you can be prewarning she can be prewarning we can be prewarning you can be prewarning they can be prewarning
Perfect	V-ing perfect
I can have prewarned you can have prewarned she can have prewarned we can have prewarned you can have prewarned they can have prewarned	I can have been prewarning you can have been prewarning she can have been prewarning we can have been prewarning you can have been prewarning they can have been prewarning

Negation

Simple form	V-ing form
I cannot prewarn you cannot prewarn she cannot prewarn we cannot prewarn you cannot prewarn they cannot prewarn	I cannot be prewarning you cannot be prewarning she cannot be prewarning we cannot be prewarning you cannot be prewarning they cannot be prewarning
Perfect	V-ing perfect
I cannot have prewarned you cannot have prewarned she cannot have prewarned we cannot have prewarned you cannot have prewarned they cannot have prewarned	I cannot have been prewarning you cannot have been prewarning she cannot have been prewarning we cannot have been prewarning you cannot have been prewarning they cannot have been prewarning

Interrogative form

Simple form	V-ing form
can I prewarn? can you prewarn? can she prewarn? can we prewarn? can you prewarn? can they prewarn?	can I be prewarning? can you be prewarning? can she be prewarning? can we be prewarning? can you be prewarning? can they be prewarning?
Perfect	V-ing perfect
can I have prewarned? can you have prewarned? can she have prewarned? can we have prewarned? can you have prewarned? can they have prewarned?	can I have been prewarning? can you have been prewarning? can she have been prewarning? can we have been prewarning? can you have been prewarning? can they have been prewarning?

Interro-negative form

Simple form	V-ing form
can I not prewarn? can you not prewarn? can she not prewarn? can we not prewarn? can you not prewarn? can they not prewarn?	can I not be prewarning? can you not be prewarning? can she not be prewarning? can we not be prewarning? can you not be prewarning? can they not be prewarning?
Perfect	V-ing perfect
can I not have prewarned? can you not have prewarned? can she not have prewarned? can we not have prewarned? can you not have prewarned? can they not have prewarned?	can I not have been prewarning? can you not have been prewarning? can she not have been prewarning? can we not have been prewarning? can you not have been prewarning? can they not have been prewarning?