must decide
Verbo regular: decide - decided- decided

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must decide
you must decide
he must decide
we must decide
you must decide
they must decide 	I must be deciding
you must be deciding
he must be deciding
we must be deciding
you must be deciding
they must be deciding	I must have decided
you must have decided
he must have decided
we must have decided
you must have decided
they must have decided	I must have been deciding
you must have been deciding
he must have been deciding
we must have been deciding
you must have been deciding
they must have been deciding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't decide
you mustn't decide
he mustn't decide
we mustn't decide
you mustn't decide
they mustn't decide 	I mustn't be deciding
you mustn't be deciding
he mustn't be deciding
we mustn't be deciding
you mustn't be deciding
they mustn't be deciding	I mustn't have decided
you mustn't have decided
he mustn't have decided
we mustn't have decided
you mustn't have decided
they mustn't have decided	I mustn't have been deciding
you mustn't have been deciding
he mustn't have been deciding
we mustn't have been deciding
you mustn't have been deciding
they mustn't have been deciding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I decide?
must you decide?
must he decide?
must we decide?
must you decide?
must they decide? 	must I be deciding?
must you be deciding?
must he be deciding?
must we be deciding?
must you be deciding?
must they be deciding? 	must I have decided?
must you have decided?
must he have decided?
must we have decided?
must you have decided?
must they have decided? 	must I have been deciding?
must you have been deciding?
must he have been deciding?
must we have been deciding?
must you have been deciding?
must they have been deciding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I decide?
mustn't you decide?
mustn't he decide?
mustn't we decide?
mustn't you decide?
mustn't they decide? 	mustn't I be deciding?
mustn't you be deciding?
mustn't he be deciding?
mustn't we be deciding?
mustn't you be deciding?
mustn't they be deciding? 	mustn't I have decided?
mustn't you have decided?
mustn't he have decided?
mustn't we have decided?
mustn't you have decided?
mustn't they have decided? 	mustn't I have been deciding?
mustn't you have been deciding?
mustn't he have been deciding?
mustn't we have been deciding?
mustn't you have been deciding?
mustn't they have been deciding?