must register
Verbo regular: register - registered- registered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must register
you must register
he must register
we must register
you must register
they must register 	I must be registering
you must be registering
he must be registering
we must be registering
you must be registering
they must be registering	I must have registered
you must have registered
he must have registered
we must have registered
you must have registered
they must have registered	I must have been registering
you must have been registering
he must have been registering
we must have been registering
you must have been registering
they must have been registering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't register
you mustn't register
he mustn't register
we mustn't register
you mustn't register
they mustn't register 	I mustn't be registering
you mustn't be registering
he mustn't be registering
we mustn't be registering
you mustn't be registering
they mustn't be registering	I mustn't have registered
you mustn't have registered
he mustn't have registered
we mustn't have registered
you mustn't have registered
they mustn't have registered	I mustn't have been registering
you mustn't have been registering
he mustn't have been registering
we mustn't have been registering
you mustn't have been registering
they mustn't have been registering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I register?
must you register?
must he register?
must we register?
must you register?
must they register? 	must I be registering?
must you be registering?
must he be registering?
must we be registering?
must you be registering?
must they be registering? 	must I have registered?
must you have registered?
must he have registered?
must we have registered?
must you have registered?
must they have registered? 	must I have been registering?
must you have been registering?
must he have been registering?
must we have been registering?
must you have been registering?
must they have been registering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I register?
mustn't you register?
mustn't he register?
mustn't we register?
mustn't you register?
mustn't they register? 	mustn't I be registering?
mustn't you be registering?
mustn't he be registering?
mustn't we be registering?
mustn't you be registering?
mustn't they be registering? 	mustn't I have registered?
mustn't you have registered?
mustn't he have registered?
mustn't we have registered?
mustn't you have registered?
mustn't they have registered? 	mustn't I have been registering?
mustn't you have been registering?
mustn't he have been registering?
mustn't we have been registering?
mustn't you have been registering?
mustn't they have been registering?