must caution
Verbo regular: caution - cautioned- cautioned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must caution
you must caution
she must caution
we must caution
you must caution
they must caution 	I must be cautioning
you must be cautioning
she must be cautioning
we must be cautioning
you must be cautioning
they must be cautioning	I must have cautioned
you must have cautioned
she must have cautioned
we must have cautioned
you must have cautioned
they must have cautioned	I must have been cautioning
you must have been cautioning
she must have been cautioning
we must have been cautioning
you must have been cautioning
they must have been cautioning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't caution
you mustn't caution
she mustn't caution
we mustn't caution
you mustn't caution
they mustn't caution 	I mustn't be cautioning
you mustn't be cautioning
she mustn't be cautioning
we mustn't be cautioning
you mustn't be cautioning
they mustn't be cautioning	I mustn't have cautioned
you mustn't have cautioned
she mustn't have cautioned
we mustn't have cautioned
you mustn't have cautioned
they mustn't have cautioned	I mustn't have been cautioning
you mustn't have been cautioning
she mustn't have been cautioning
we mustn't have been cautioning
you mustn't have been cautioning
they mustn't have been cautioning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I caution?
must you caution?
must she caution?
must we caution?
must you caution?
must they caution? 	must I be cautioning?
must you be cautioning?
must she be cautioning?
must we be cautioning?
must you be cautioning?
must they be cautioning? 	must I have cautioned?
must you have cautioned?
must she have cautioned?
must we have cautioned?
must you have cautioned?
must they have cautioned? 	must I have been cautioning?
must you have been cautioning?
must she have been cautioning?
must we have been cautioning?
must you have been cautioning?
must they have been cautioning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I caution?
mustn't you caution?
mustn't she caution?
mustn't we caution?
mustn't you caution?
mustn't they caution? 	mustn't I be cautioning?
mustn't you be cautioning?
mustn't she be cautioning?
mustn't we be cautioning?
mustn't you be cautioning?
mustn't they be cautioning? 	mustn't I have cautioned?
mustn't you have cautioned?
mustn't she have cautioned?
mustn't we have cautioned?
mustn't you have cautioned?
mustn't they have cautioned? 	mustn't I have been cautioning?
mustn't you have been cautioning?
mustn't she have been cautioning?
mustn't we have been cautioning?
mustn't you have been cautioning?
mustn't they have been cautioning?