must richen
Verbo regular: richen - richened- richened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must richen
you must richen
he must richen
we must richen
you must richen
they must richen 	I must be richening
you must be richening
he must be richening
we must be richening
you must be richening
they must be richening	I must have richened
you must have richened
he must have richened
we must have richened
you must have richened
they must have richened	I must have been richening
you must have been richening
he must have been richening
we must have been richening
you must have been richening
they must have been richening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not richen
you must not richen
he must not richen
we must not richen
you must not richen
they must not richen 	I must not be richening
you must not be richening
he must not be richening
we must not be richening
you must not be richening
they must not be richening	I must not have richened
you must not have richened
he must not have richened
we must not have richened
you must not have richened
they must not have richened	I must not have been richening
you must not have been richening
he must not have been richening
we must not have been richening
you must not have been richening
they must not have been richening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I richen?
must you richen?
must he richen?
must we richen?
must you richen?
must they richen? 	must I be richening?
must you be richening?
must he be richening?
must we be richening?
must you be richening?
must they be richening? 	must I have richened?
must you have richened?
must he have richened?
must we have richened?
must you have richened?
must they have richened? 	must I have been richening?
must you have been richening?
must he have been richening?
must we have been richening?
must you have been richening?
must they have been richening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not richen?
must you not richen?
must he not richen?
must we not richen?
must you not richen?
must they not richen? 	must I not be richening?
must you not be richening?
must he not be richening?
must we not be richening?
must you not be richening?
must they not be richening? 	must I not have richened?
must you not have richened?
must he not have richened?
must we not have richened?
must you not have richened?
must they not have richened? 	must I not have been richening?
must you not have been richening?
must he not have been richening?
must we not have been richening?
must you not have been richening?
must they not have been richening?