must fill
Verbo regular: fill - filled- filled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fill
you must fill
she must fill
we must fill
you must fill
they must fill 	I must be filling
you must be filling
she must be filling
we must be filling
you must be filling
they must be filling	I must have filled
you must have filled
she must have filled
we must have filled
you must have filled
they must have filled	I must have been filling
you must have been filling
she must have been filling
we must have been filling
you must have been filling
they must have been filling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't fill
you mustn't fill
she mustn't fill
we mustn't fill
you mustn't fill
they mustn't fill 	I mustn't be filling
you mustn't be filling
she mustn't be filling
we mustn't be filling
you mustn't be filling
they mustn't be filling	I mustn't have filled
you mustn't have filled
she mustn't have filled
we mustn't have filled
you mustn't have filled
they mustn't have filled	I mustn't have been filling
you mustn't have been filling
she mustn't have been filling
we mustn't have been filling
you mustn't have been filling
they mustn't have been filling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fill?
must you fill?
must she fill?
must we fill?
must you fill?
must they fill? 	must I be filling?
must you be filling?
must she be filling?
must we be filling?
must you be filling?
must they be filling? 	must I have filled?
must you have filled?
must she have filled?
must we have filled?
must you have filled?
must they have filled? 	must I have been filling?
must you have been filling?
must she have been filling?
must we have been filling?
must you have been filling?
must they have been filling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I fill?
mustn't you fill?
mustn't she fill?
mustn't we fill?
mustn't you fill?
mustn't they fill? 	mustn't I be filling?
mustn't you be filling?
mustn't she be filling?
mustn't we be filling?
mustn't you be filling?
mustn't they be filling? 	mustn't I have filled?
mustn't you have filled?
mustn't she have filled?
mustn't we have filled?
mustn't you have filled?
mustn't they have filled? 	mustn't I have been filling?
mustn't you have been filling?
mustn't she have been filling?
mustn't we have been filling?
mustn't you have been filling?
mustn't they have been filling?