must nibble
Verbo regular: nibble - nibbled- nibbled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must nibble
you must nibble
he must nibble
we must nibble
you must nibble
they must nibble 	I must be nibbling
you must be nibbling
he must be nibbling
we must be nibbling
you must be nibbling
they must be nibbling	I must have nibbled
you must have nibbled
he must have nibbled
we must have nibbled
you must have nibbled
they must have nibbled	I must have been nibbling
you must have been nibbling
he must have been nibbling
we must have been nibbling
you must have been nibbling
they must have been nibbling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't nibble
you mustn't nibble
he mustn't nibble
we mustn't nibble
you mustn't nibble
they mustn't nibble 	I mustn't be nibbling
you mustn't be nibbling
he mustn't be nibbling
we mustn't be nibbling
you mustn't be nibbling
they mustn't be nibbling	I mustn't have nibbled
you mustn't have nibbled
he mustn't have nibbled
we mustn't have nibbled
you mustn't have nibbled
they mustn't have nibbled	I mustn't have been nibbling
you mustn't have been nibbling
he mustn't have been nibbling
we mustn't have been nibbling
you mustn't have been nibbling
they mustn't have been nibbling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I nibble?
must you nibble?
must he nibble?
must we nibble?
must you nibble?
must they nibble? 	must I be nibbling?
must you be nibbling?
must he be nibbling?
must we be nibbling?
must you be nibbling?
must they be nibbling? 	must I have nibbled?
must you have nibbled?
must he have nibbled?
must we have nibbled?
must you have nibbled?
must they have nibbled? 	must I have been nibbling?
must you have been nibbling?
must he have been nibbling?
must we have been nibbling?
must you have been nibbling?
must they have been nibbling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I nibble?
mustn't you nibble?
mustn't he nibble?
mustn't we nibble?
mustn't you nibble?
mustn't they nibble? 	mustn't I be nibbling?
mustn't you be nibbling?
mustn't he be nibbling?
mustn't we be nibbling?
mustn't you be nibbling?
mustn't they be nibbling? 	mustn't I have nibbled?
mustn't you have nibbled?
mustn't he have nibbled?
mustn't we have nibbled?
mustn't you have nibbled?
mustn't they have nibbled? 	mustn't I have been nibbling?
mustn't you have been nibbling?
mustn't he have been nibbling?
mustn't we have been nibbling?
mustn't you have been nibbling?
mustn't they have been nibbling?