must restrengthen
Regular verb: restrengthen - restrengthened- restrengthened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't restrengthen
you mustn't restrengthen
he mustn't restrengthen
we mustn't restrengthen
you mustn't restrengthen
they mustn't restrengthen 	I mustn't be restrengthening
you mustn't be restrengthening
he mustn't be restrengthening
we mustn't be restrengthening
you mustn't be restrengthening
they mustn't be restrengthening	I mustn't have restrengthened
you mustn't have restrengthened
he mustn't have restrengthened
we mustn't have restrengthened
you mustn't have restrengthened
they mustn't have restrengthened	I mustn't have been restrengthening
you mustn't have been restrengthening
he mustn't have been restrengthening
we mustn't have been restrengthening
you mustn't have been restrengthening
they mustn't have been restrengthening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I restrengthen?
mustn't you restrengthen?
mustn't he restrengthen?
mustn't we restrengthen?
mustn't you restrengthen?
mustn't they restrengthen? 	mustn't I be restrengthening?
mustn't you be restrengthening?
mustn't he be restrengthening?
mustn't we be restrengthening?
mustn't you be restrengthening?
mustn't they be restrengthening? 	mustn't I have restrengthened?
mustn't you have restrengthened?
mustn't he have restrengthened?
mustn't we have restrengthened?
mustn't you have restrengthened?
mustn't they have restrengthened? 	mustn't I have been restrengthening?
mustn't you have been restrengthening?
mustn't he have been restrengthening?
mustn't we have been restrengthening?
mustn't you have been restrengthening?
mustn't they have been restrengthening?