must prewarn
Verbo regular: prewarn - prewarned- prewarned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must prewarn
you must prewarn
he must prewarn
we must prewarn
you must prewarn
they must prewarn 	I must be prewarning
you must be prewarning
he must be prewarning
we must be prewarning
you must be prewarning
they must be prewarning	I must have prewarned
you must have prewarned
he must have prewarned
we must have prewarned
you must have prewarned
they must have prewarned	I must have been prewarning
you must have been prewarning
he must have been prewarning
we must have been prewarning
you must have been prewarning
they must have been prewarning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not prewarn
you must not prewarn
he must not prewarn
we must not prewarn
you must not prewarn
they must not prewarn 	I must not be prewarning
you must not be prewarning
he must not be prewarning
we must not be prewarning
you must not be prewarning
they must not be prewarning	I must not have prewarned
you must not have prewarned
he must not have prewarned
we must not have prewarned
you must not have prewarned
they must not have prewarned	I must not have been prewarning
you must not have been prewarning
he must not have been prewarning
we must not have been prewarning
you must not have been prewarning
they must not have been prewarning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I prewarn?
must you prewarn?
must he prewarn?
must we prewarn?
must you prewarn?
must they prewarn? 	must I be prewarning?
must you be prewarning?
must he be prewarning?
must we be prewarning?
must you be prewarning?
must they be prewarning? 	must I have prewarned?
must you have prewarned?
must he have prewarned?
must we have prewarned?
must you have prewarned?
must they have prewarned? 	must I have been prewarning?
must you have been prewarning?
must he have been prewarning?
must we have been prewarning?
must you have been prewarning?
must they have been prewarning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not prewarn?
must you not prewarn?
must he not prewarn?
must we not prewarn?
must you not prewarn?
must they not prewarn? 	must I not be prewarning?
must you not be prewarning?
must he not be prewarning?
must we not be prewarning?
must you not be prewarning?
must they not be prewarning? 	must I not have prewarned?
must you not have prewarned?
must he not have prewarned?
must we not have prewarned?
must you not have prewarned?
must they not have prewarned? 	must I not have been prewarning?
must you not have been prewarning?
must he not have been prewarning?
must we not have been prewarning?
must you not have been prewarning?
must they not have been prewarning?