English verb conjugation
CAN PREWARN

Regular verb: prewarn - prewarned - prewarned

Affirmation

Simple form	V-ing form
I can prewarn you can prewarn he can prewarn we can prewarn you can prewarn they can prewarn	I can be prewarning you can be prewarning he 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 he 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 he 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 can't prewarn you can't prewarn he can't prewarn we can't prewarn you can't prewarn they can't prewarn	I can't be prewarning you can't be prewarning he can't be prewarning we can't be prewarning you can't be prewarning they can't be prewarning
Perfect	V-ing perfect
I can't have prewarned you can't have prewarned he can't have prewarned we can't have prewarned you can't have prewarned they can't have prewarned	I can't have been prewarning you can't have been prewarning he can't have been prewarning we can't have been prewarning you can't have been prewarning they can't have been prewarning

Interrogative form

Simple form	V-ing form
can I prewarn? can you prewarn? can he prewarn? can we prewarn? can you prewarn? can they prewarn?	can I be prewarning? can you be prewarning? can he 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 he 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 he 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't I prewarn? can't you prewarn? can't he prewarn? can't we prewarn? can't you prewarn? can't they prewarn?	can't I be prewarning? can't you be prewarning? can't he be prewarning? can't we be prewarning? can't you be prewarning? can't they be prewarning?
Perfect	V-ing perfect
can't I have prewarned? can't you have prewarned? can't he have prewarned? can't we have prewarned? can't you have prewarned? can't they have prewarned?	can't I have been prewarning? can't you have been prewarning? can't he have been prewarning? can't we have been prewarning? can't you have been prewarning? can't they have been prewarning?