must fumble
Verbo regular: fumble - fumbled- fumbled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fumble
you must fumble
he must fumble
we must fumble
you must fumble
they must fumble 	I must be fumbling
you must be fumbling
he must be fumbling
we must be fumbling
you must be fumbling
they must be fumbling	I must have fumbled
you must have fumbled
he must have fumbled
we must have fumbled
you must have fumbled
they must have fumbled	I must have been fumbling
you must have been fumbling
he must have been fumbling
we must have been fumbling
you must have been fumbling
they must have been fumbling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't fumble
you mustn't fumble
he mustn't fumble
we mustn't fumble
you mustn't fumble
they mustn't fumble 	I mustn't be fumbling
you mustn't be fumbling
he mustn't be fumbling
we mustn't be fumbling
you mustn't be fumbling
they mustn't be fumbling	I mustn't have fumbled
you mustn't have fumbled
he mustn't have fumbled
we mustn't have fumbled
you mustn't have fumbled
they mustn't have fumbled	I mustn't have been fumbling
you mustn't have been fumbling
he mustn't have been fumbling
we mustn't have been fumbling
you mustn't have been fumbling
they mustn't have been fumbling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fumble?
must you fumble?
must he fumble?
must we fumble?
must you fumble?
must they fumble? 	must I be fumbling?
must you be fumbling?
must he be fumbling?
must we be fumbling?
must you be fumbling?
must they be fumbling? 	must I have fumbled?
must you have fumbled?
must he have fumbled?
must we have fumbled?
must you have fumbled?
must they have fumbled? 	must I have been fumbling?
must you have been fumbling?
must he have been fumbling?
must we have been fumbling?
must you have been fumbling?
must they have been fumbling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I fumble?
mustn't you fumble?
mustn't he fumble?
mustn't we fumble?
mustn't you fumble?
mustn't they fumble? 	mustn't I be fumbling?
mustn't you be fumbling?
mustn't he be fumbling?
mustn't we be fumbling?
mustn't you be fumbling?
mustn't they be fumbling? 	mustn't I have fumbled?
mustn't you have fumbled?
mustn't he have fumbled?
mustn't we have fumbled?
mustn't you have fumbled?
mustn't they have fumbled? 	mustn't I have been fumbling?
mustn't you have been fumbling?
mustn't he have been fumbling?
mustn't we have been fumbling?
mustn't you have been fumbling?
mustn't they have been fumbling?