must warn
Verbo regular: warn - warned- warned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must warn
you must warn
she must warn
we must warn
you must warn
they must warn 	I must be warning
you must be warning
she must be warning
we must be warning
you must be warning
they must be warning	I must have warned
you must have warned
she must have warned
we must have warned
you must have warned
they must have warned	I must have been warning
you must have been warning
she must have been warning
we must have been warning
you must have been warning
they must have been warning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't warn
you mustn't warn
she mustn't warn
we mustn't warn
you mustn't warn
they mustn't warn 	I mustn't be warning
you mustn't be warning
she mustn't be warning
we mustn't be warning
you mustn't be warning
they mustn't be warning	I mustn't have warned
you mustn't have warned
she mustn't have warned
we mustn't have warned
you mustn't have warned
they mustn't have warned	I mustn't have been warning
you mustn't have been warning
she mustn't have been warning
we mustn't have been warning
you mustn't have been warning
they mustn't have been warning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I warn?
must you warn?
must she warn?
must we warn?
must you warn?
must they warn? 	must I be warning?
must you be warning?
must she be warning?
must we be warning?
must you be warning?
must they be warning? 	must I have warned?
must you have warned?
must she have warned?
must we have warned?
must you have warned?
must they have warned? 	must I have been warning?
must you have been warning?
must she have been warning?
must we have been warning?
must you have been warning?
must they have been warning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I warn?
mustn't you warn?
mustn't she warn?
mustn't we warn?
mustn't you warn?
mustn't they warn? 	mustn't I be warning?
mustn't you be warning?
mustn't she be warning?
mustn't we be warning?
mustn't you be warning?
mustn't they be warning? 	mustn't I have warned?
mustn't you have warned?
mustn't she have warned?
mustn't we have warned?
mustn't you have warned?
mustn't they have warned? 	mustn't I have been warning?
mustn't you have been warning?
mustn't she have been warning?
mustn't we have been warning?
mustn't you have been warning?
mustn't they have been warning?