must last
Verbo regular: last - lasted- lasted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not last
you must not last
he must not last
we must not last
you must not last
they must not last 	I must not be lasting
you must not be lasting
he must not be lasting
we must not be lasting
you must not be lasting
they must not be lasting	I must not have lasted
you must not have lasted
he must not have lasted
we must not have lasted
you must not have lasted
they must not have lasted	I must not have been lasting
you must not have been lasting
he must not have been lasting
we must not have been lasting
you must not have been lasting
they must not have been lasting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con 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-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not last?
must you not last?
must he not last?
must we not last?
must you not last?
must they not last? 	must I not be lasting?
must you not be lasting?
must he not be lasting?
must we not be lasting?
must you not be lasting?
must they not be lasting? 	must I not have lasted?
must you not have lasted?
must he not have lasted?
must we not have lasted?
must you not have lasted?
must they not have lasted? 	must I not have been lasting?
must you not have been lasting?
must he not have been lasting?
must we not have been lasting?
must you not have been lasting?
must they not have been lasting?