must last
Verbo regular: last - lasted- lasted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must last
you must last
he must last
we must last
you must last
they must last 	I must be lasting
you must be lasting
he must be lasting
we must be lasting
you must be lasting
they must be lasting	I must have lasted
you must have lasted
he must have lasted
we must have lasted
you must have lasted
they must have lasted	I must have been lasting
you must have been lasting
he must have been lasting
we must have been lasting
you must have been lasting
they must have been lasting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't last
you mustn't last
he mustn't last
we mustn't last
you mustn't last
they mustn't last 	I mustn't be lasting
you mustn't be lasting
he mustn't be lasting
we mustn't be lasting
you mustn't be lasting
they mustn't be lasting	I mustn't have lasted
you mustn't have lasted
he mustn't have lasted
we mustn't have lasted
you mustn't have lasted
they mustn't have lasted	I mustn't have been lasting
you mustn't have been lasting
he mustn't have been lasting
we mustn't have been lasting
you mustn't have been lasting
they mustn't have been lasting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I last?
must you last?
must he last?
must we last?
must you last?
must they last? 	must I be lasting?
must you be lasting?
must he be lasting?
must we be lasting?
must you be lasting?
must they be lasting? 	must I have lasted?
must you have lasted?
must he have lasted?
must we have lasted?
must you have lasted?
must they have lasted? 	must I have been lasting?
must you have been lasting?
must he have been lasting?
must we have been lasting?
must you have been lasting?
must they have been lasting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I last?
mustn't you last?
mustn't he last?
mustn't we last?
mustn't you last?
mustn't they last? 	mustn't I be lasting?
mustn't you be lasting?
mustn't he be lasting?
mustn't we be lasting?
mustn't you be lasting?
mustn't they be lasting? 	mustn't I have lasted?
mustn't you have lasted?
mustn't he have lasted?
mustn't we have lasted?
mustn't you have lasted?
mustn't they have lasted? 	mustn't I have been lasting?
mustn't you have been lasting?
mustn't he have been lasting?
mustn't we have been lasting?
mustn't you have been lasting?
mustn't they have been lasting?