must rib
Verbo regular: rib - ribed- ribed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must rib
you must rib
he must rib
we must rib
you must rib
they must rib 	I must be ribing
you must be ribing
he must be ribing
we must be ribing
you must be ribing
they must be ribing	I must have ribed
you must have ribed
he must have ribed
we must have ribed
you must have ribed
they must have ribed	I must have been ribing
you must have been ribing
he must have been ribing
we must have been ribing
you must have been ribing
they must have been ribing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not rib
you must not rib
he must not rib
we must not rib
you must not rib
they must not rib 	I must not be ribing
you must not be ribing
he must not be ribing
we must not be ribing
you must not be ribing
they must not be ribing	I must not have ribed
you must not have ribed
he must not have ribed
we must not have ribed
you must not have ribed
they must not have ribed	I must not have been ribing
you must not have been ribing
he must not have been ribing
we must not have been ribing
you must not have been ribing
they must not have been ribing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I rib?
must you rib?
must he rib?
must we rib?
must you rib?
must they rib? 	must I be ribing?
must you be ribing?
must he be ribing?
must we be ribing?
must you be ribing?
must they be ribing? 	must I have ribed?
must you have ribed?
must he have ribed?
must we have ribed?
must you have ribed?
must they have ribed? 	must I have been ribing?
must you have been ribing?
must he have been ribing?
must we have been ribing?
must you have been ribing?
must they have been ribing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not rib?
must you not rib?
must he not rib?
must we not rib?
must you not rib?
must they not rib? 	must I not be ribing?
must you not be ribing?
must he not be ribing?
must we not be ribing?
must you not be ribing?
must they not be ribing? 	must I not have ribed?
must you not have ribed?
must he not have ribed?
must we not have ribed?
must you not have ribed?
must they not have ribed? 	must I not have been ribing?
must you not have been ribing?
must he not have been ribing?
must we not have been ribing?
must you not have been ribing?
must they not have been ribing?