must keep
Verbo irregular: keep - kept- kept

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must keep
you must keep
he must keep
we must keep
you must keep
they must keep 	I must be keeping
you must be keeping
he must be keeping
we must be keeping
you must be keeping
they must be keeping	I must have kept
you must have kept
he must have kept
we must have kept
you must have kept
they must have kept	I must have been keeping
you must have been keeping
he must have been keeping
we must have been keeping
you must have been keeping
they must have been keeping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't keep
you mustn't keep
he mustn't keep
we mustn't keep
you mustn't keep
they mustn't keep 	I mustn't be keeping
you mustn't be keeping
he mustn't be keeping
we mustn't be keeping
you mustn't be keeping
they mustn't be keeping	I mustn't have kept
you mustn't have kept
he mustn't have kept
we mustn't have kept
you mustn't have kept
they mustn't have kept	I mustn't have been keeping
you mustn't have been keeping
he mustn't have been keeping
we mustn't have been keeping
you mustn't have been keeping
they mustn't have been keeping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I keep?
must you keep?
must he keep?
must we keep?
must you keep?
must they keep? 	must I be keeping?
must you be keeping?
must he be keeping?
must we be keeping?
must you be keeping?
must they be keeping? 	must I have kept?
must you have kept?
must he have kept?
must we have kept?
must you have kept?
must they have kept? 	must I have been keeping?
must you have been keeping?
must he have been keeping?
must we have been keeping?
must you have been keeping?
must they have been keeping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I keep?
mustn't you keep?
mustn't he keep?
mustn't we keep?
mustn't you keep?
mustn't they keep? 	mustn't I be keeping?
mustn't you be keeping?
mustn't he be keeping?
mustn't we be keeping?
mustn't you be keeping?
mustn't they be keeping? 	mustn't I have kept?
mustn't you have kept?
mustn't he have kept?
mustn't we have kept?
mustn't you have kept?
mustn't they have kept? 	mustn't I have been keeping?
mustn't you have been keeping?
mustn't he have been keeping?
mustn't we have been keeping?
mustn't you have been keeping?
mustn't they have been keeping?