must giggle
Verbo regular: giggle - giggled- giggled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must giggle
you must giggle
he must giggle
we must giggle
you must giggle
they must giggle 	I must be giggling
you must be giggling
he must be giggling
we must be giggling
you must be giggling
they must be giggling	I must have giggled
you must have giggled
he must have giggled
we must have giggled
you must have giggled
they must have giggled	I must have been giggling
you must have been giggling
he must have been giggling
we must have been giggling
you must have been giggling
they must have been giggling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't giggle
you mustn't giggle
he mustn't giggle
we mustn't giggle
you mustn't giggle
they mustn't giggle 	I mustn't be giggling
you mustn't be giggling
he mustn't be giggling
we mustn't be giggling
you mustn't be giggling
they mustn't be giggling	I mustn't have giggled
you mustn't have giggled
he mustn't have giggled
we mustn't have giggled
you mustn't have giggled
they mustn't have giggled	I mustn't have been giggling
you mustn't have been giggling
he mustn't have been giggling
we mustn't have been giggling
you mustn't have been giggling
they mustn't have been giggling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I giggle?
must you giggle?
must he giggle?
must we giggle?
must you giggle?
must they giggle? 	must I be giggling?
must you be giggling?
must he be giggling?
must we be giggling?
must you be giggling?
must they be giggling? 	must I have giggled?
must you have giggled?
must he have giggled?
must we have giggled?
must you have giggled?
must they have giggled? 	must I have been giggling?
must you have been giggling?
must he have been giggling?
must we have been giggling?
must you have been giggling?
must they have been giggling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I giggle?
mustn't you giggle?
mustn't he giggle?
mustn't we giggle?
mustn't you giggle?
mustn't they giggle? 	mustn't I be giggling?
mustn't you be giggling?
mustn't he be giggling?
mustn't we be giggling?
mustn't you be giggling?
mustn't they be giggling? 	mustn't I have giggled?
mustn't you have giggled?
mustn't he have giggled?
mustn't we have giggled?
mustn't you have giggled?
mustn't they have giggled? 	mustn't I have been giggling?
mustn't you have been giggling?
mustn't he have been giggling?
mustn't we have been giggling?
mustn't you have been giggling?
mustn't they have been giggling?