must behave
Verbo regular: behave - behaved- behaved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must behave
you must behave
he must behave
we must behave
you must behave
they must behave 	I must be behaving
you must be behaving
he must be behaving
we must be behaving
you must be behaving
they must be behaving	I must have behaved
you must have behaved
he must have behaved
we must have behaved
you must have behaved
they must have behaved	I must have been behaving
you must have been behaving
he must have been behaving
we must have been behaving
you must have been behaving
they must have been behaving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't behave
you mustn't behave
he mustn't behave
we mustn't behave
you mustn't behave
they mustn't behave 	I mustn't be behaving
you mustn't be behaving
he mustn't be behaving
we mustn't be behaving
you mustn't be behaving
they mustn't be behaving	I mustn't have behaved
you mustn't have behaved
he mustn't have behaved
we mustn't have behaved
you mustn't have behaved
they mustn't have behaved	I mustn't have been behaving
you mustn't have been behaving
he mustn't have been behaving
we mustn't have been behaving
you mustn't have been behaving
they mustn't have been behaving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I behave?
must you behave?
must he behave?
must we behave?
must you behave?
must they behave? 	must I be behaving?
must you be behaving?
must he be behaving?
must we be behaving?
must you be behaving?
must they be behaving? 	must I have behaved?
must you have behaved?
must he have behaved?
must we have behaved?
must you have behaved?
must they have behaved? 	must I have been behaving?
must you have been behaving?
must he have been behaving?
must we have been behaving?
must you have been behaving?
must they have been behaving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I behave?
mustn't you behave?
mustn't he behave?
mustn't we behave?
mustn't you behave?
mustn't they behave? 	mustn't I be behaving?
mustn't you be behaving?
mustn't he be behaving?
mustn't we be behaving?
mustn't you be behaving?
mustn't they be behaving? 	mustn't I have behaved?
mustn't you have behaved?
mustn't he have behaved?
mustn't we have behaved?
mustn't you have behaved?
mustn't they have behaved? 	mustn't I have been behaving?
mustn't you have been behaving?
mustn't he have been behaving?
mustn't we have been behaving?
mustn't you have been behaving?
mustn't they have been behaving?