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 must not register
you must not register
he must not register
we must not register
you must not register
they must not register 	I must not be registering
you must not be registering
he must not be registering
we must not be registering
you must not be registering
they must not be registering	I must not have registered
you must not have registered
he must not have registered
we must not have registered
you must not have registered
they must not have registered	I must not have been registering
you must not have been registering
he must not have been registering
we must not have been registering
you must not have been registering
they must not 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 	
must I not register?
must you not register?
must he not register?
must we not register?
must you not register?
must they not register? 	must I not be registering?
must you not be registering?
must he not be registering?
must we not be registering?
must you not be registering?
must they not be registering? 	must I not have registered?
must you not have registered?
must he not have registered?
must we not have registered?
must you not have registered?
must they not have registered? 	must I not have been registering?
must you not have been registering?
must he not have been registering?
must we not have been registering?
must you not have been registering?
must they not have been registering?