must ask
Verbo regular: ask - asked- asked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must ask
you must ask
he must ask
we must ask
you must ask
they must ask 	I must be asking
you must be asking
he must be asking
we must be asking
you must be asking
they must be asking	I must have asked
you must have asked
he must have asked
we must have asked
you must have asked
they must have asked	I must have been asking
you must have been asking
he must have been asking
we must have been asking
you must have been asking
they must have been asking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't ask
you mustn't ask
he mustn't ask
we mustn't ask
you mustn't ask
they mustn't ask 	I mustn't be asking
you mustn't be asking
he mustn't be asking
we mustn't be asking
you mustn't be asking
they mustn't be asking	I mustn't have asked
you mustn't have asked
he mustn't have asked
we mustn't have asked
you mustn't have asked
they mustn't have asked	I mustn't have been asking
you mustn't have been asking
he mustn't have been asking
we mustn't have been asking
you mustn't have been asking
they mustn't have been asking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I ask?
must you ask?
must he ask?
must we ask?
must you ask?
must they ask? 	must I be asking?
must you be asking?
must he be asking?
must we be asking?
must you be asking?
must they be asking? 	must I have asked?
must you have asked?
must he have asked?
must we have asked?
must you have asked?
must they have asked? 	must I have been asking?
must you have been asking?
must he have been asking?
must we have been asking?
must you have been asking?
must they have been asking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I ask?
mustn't you ask?
mustn't he ask?
mustn't we ask?
mustn't you ask?
mustn't they ask? 	mustn't I be asking?
mustn't you be asking?
mustn't he be asking?
mustn't we be asking?
mustn't you be asking?
mustn't they be asking? 	mustn't I have asked?
mustn't you have asked?
mustn't he have asked?
mustn't we have asked?
mustn't you have asked?
mustn't they have asked? 	mustn't I have been asking?
mustn't you have been asking?
mustn't he have been asking?
mustn't we have been asking?
mustn't you have been asking?
mustn't they have been asking?