must crib
Verbo regular: crib - cribbed- cribbed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must crib
you must crib
he must crib
we must crib
you must crib
they must crib 	I must be cribbing
you must be cribbing
he must be cribbing
we must be cribbing
you must be cribbing
they must be cribbing	I must have cribbed
you must have cribbed
he must have cribbed
we must have cribbed
you must have cribbed
they must have cribbed	I must have been cribbing
you must have been cribbing
he must have been cribbing
we must have been cribbing
you must have been cribbing
they must have been cribbing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not crib
you must not crib
he must not crib
we must not crib
you must not crib
they must not crib 	I must not be cribbing
you must not be cribbing
he must not be cribbing
we must not be cribbing
you must not be cribbing
they must not be cribbing	I must not have cribbed
you must not have cribbed
he must not have cribbed
we must not have cribbed
you must not have cribbed
they must not have cribbed	I must not have been cribbing
you must not have been cribbing
he must not have been cribbing
we must not have been cribbing
you must not have been cribbing
they must not have been cribbing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I crib?
must you crib?
must he crib?
must we crib?
must you crib?
must they crib? 	must I be cribbing?
must you be cribbing?
must he be cribbing?
must we be cribbing?
must you be cribbing?
must they be cribbing? 	must I have cribbed?
must you have cribbed?
must he have cribbed?
must we have cribbed?
must you have cribbed?
must they have cribbed? 	must I have been cribbing?
must you have been cribbing?
must he have been cribbing?
must we have been cribbing?
must you have been cribbing?
must they have been cribbing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not crib?
must you not crib?
must he not crib?
must we not crib?
must you not crib?
must they not crib? 	must I not be cribbing?
must you not be cribbing?
must he not be cribbing?
must we not be cribbing?
must you not be cribbing?
must they not be cribbing? 	must I not have cribbed?
must you not have cribbed?
must he not have cribbed?
must we not have cribbed?
must you not have cribbed?
must they not have cribbed? 	must I not have been cribbing?
must you not have been cribbing?
must he not have been cribbing?
must we not have been cribbing?
must you not have been cribbing?
must they not have been cribbing?