should prewarn
Regular verb: prewarn - prewarned- prewarned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd prewarn
you'd prewarn
she'd prewarn
we'd prewarn
you'd prewarn
they'd prewarn 	I'd be prewarning
you'd be prewarning
she'd be prewarning
we'd be prewarning
you'd be prewarning
they'd be prewarning	I should've prewarned
you should've prewarned
she should've prewarned
we should've prewarned
you should've prewarned
they should've prewarned	I should've been prewarning
you should've been prewarning
she should've been prewarning
we should've been prewarning
you should've been prewarning
they should've been prewarning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't prewarn
you shouldn't prewarn
she shouldn't prewarn
we shouldn't prewarn
you shouldn't prewarn
they shouldn't prewarn 	I shouldn't be prewarning
you shouldn't be prewarning
she shouldn't be prewarning
we shouldn't be prewarning
you shouldn't be prewarning
they shouldn't be prewarning	I shouldn't have prewarned
you shouldn't have prewarned
she shouldn't have prewarned
we shouldn't have prewarned
you shouldn't have prewarned
they shouldn't have prewarned	I shouldn't have been prewarning
you shouldn't have been prewarning
she shouldn't have been prewarning
we shouldn't have been prewarning
you shouldn't have been prewarning
they shouldn't have been prewarning	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I prewarn?
shouldn't you prewarn?
shouldn't she prewarn?
shouldn't we prewarn?
shouldn't you prewarn?
shouldn't they prewarn? 	shouldn't I be prewarning?
shouldn't you be prewarning?
shouldn't she be prewarning?
shouldn't we be prewarning?
shouldn't you be prewarning?
shouldn't they be prewarning? 	shouldn't I have prewarned?
shouldn't you have prewarned?
shouldn't she have prewarned?
shouldn't we have prewarned?
shouldn't you have prewarned?
shouldn't they have prewarned? 	shouldn't I have been prewarning?
shouldn't you have been prewarning?
shouldn't she have been prewarning?
shouldn't we have been prewarning?
shouldn't you have been prewarning?
shouldn't they have been prewarning?