must restrengthen
Verbo regular: restrengthen - restrengthened- restrengthened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must restrengthen
you must restrengthen
he must restrengthen
we must restrengthen
you must restrengthen
they must restrengthen 	I must be restrengthening
you must be restrengthening
he must be restrengthening
we must be restrengthening
you must be restrengthening
they must be restrengthening	I must have restrengthened
you must have restrengthened
he must have restrengthened
we must have restrengthened
you must have restrengthened
they must have restrengthened	I must have been restrengthening
you must have been restrengthening
he must have been restrengthening
we must have been restrengthening
you must have been restrengthening
they must have been restrengthening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not restrengthen
you must not restrengthen
he must not restrengthen
we must not restrengthen
you must not restrengthen
they must not restrengthen 	I must not be restrengthening
you must not be restrengthening
he must not be restrengthening
we must not be restrengthening
you must not be restrengthening
they must not be restrengthening	I must not have restrengthened
you must not have restrengthened
he must not have restrengthened
we must not have restrengthened
you must not have restrengthened
they must not have restrengthened	I must not have been restrengthening
you must not have been restrengthening
he must not have been restrengthening
we must not have been restrengthening
you must not have been restrengthening
they must not have been restrengthening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I restrengthen?
must you restrengthen?
must he restrengthen?
must we restrengthen?
must you restrengthen?
must they restrengthen? 	must I be restrengthening?
must you be restrengthening?
must he be restrengthening?
must we be restrengthening?
must you be restrengthening?
must they be restrengthening? 	must I have restrengthened?
must you have restrengthened?
must he have restrengthened?
must we have restrengthened?
must you have restrengthened?
must they have restrengthened? 	must I have been restrengthening?
must you have been restrengthening?
must he have been restrengthening?
must we have been restrengthening?
must you have been restrengthening?
must they have been restrengthening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not restrengthen?
must you not restrengthen?
must he not restrengthen?
must we not restrengthen?
must you not restrengthen?
must they not restrengthen? 	must I not be restrengthening?
must you not be restrengthening?
must he not be restrengthening?
must we not be restrengthening?
must you not be restrengthening?
must they not be restrengthening? 	must I not have restrengthened?
must you not have restrengthened?
must he not have restrengthened?
must we not have restrengthened?
must you not have restrengthened?
must they not have restrengthened? 	must I not have been restrengthening?
must you not have been restrengthening?
must he not have been restrengthening?
must we not have been restrengthening?
must you not have been restrengthening?
must they not have been restrengthening?