must rive
Verbo irregular: rive - rived- rived, riven

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must rive
you must rive
he must rive
we must rive
you must rive
they must rive 	I must be riving
you must be riving
he must be riving
we must be riving
you must be riving
they must be riving	I must have rived, riven
you must have rived, riven
he must have rived, riven
we must have rived, riven
you must have rived, riven
they must have rived, riven	I must have been riving
you must have been riving
he must have been riving
we must have been riving
you must have been riving
they must have been riving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not rive
you must not rive
he must not rive
we must not rive
you must not rive
they must not rive 	I must not be riving
you must not be riving
he must not be riving
we must not be riving
you must not be riving
they must not be riving	I must not have rived, riven
you must not have rived, riven
he must not have rived, riven
we must not have rived, riven
you must not have rived, riven
they must not have rived, riven	I must not have been riving
you must not have been riving
he must not have been riving
we must not have been riving
you must not have been riving
they must not have been riving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I rive?
must you rive?
must he rive?
must we rive?
must you rive?
must they rive? 	must I be riving?
must you be riving?
must he be riving?
must we be riving?
must you be riving?
must they be riving? 	must I have rived, riven?
must you have rived, riven?
must he have rived, riven?
must we have rived, riven?
must you have rived, riven?
must they have rived, riven? 	must I have been riving?
must you have been riving?
must he have been riving?
must we have been riving?
must you have been riving?
must they have been riving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not rive?
must you not rive?
must he not rive?
must we not rive?
must you not rive?
must they not rive? 	must I not be riving?
must you not be riving?
must he not be riving?
must we not be riving?
must you not be riving?
must they not be riving? 	must I not have rived, riven?
must you not have rived, riven?
must he not have rived, riven?
must we not have rived, riven?
must you not have rived, riven?
must they not have rived, riven? 	must I not have been riving?
must you not have been riving?
must he not have been riving?
must we not have been riving?
must you not have been riving?
must they not have been riving?