must fold
Verbo regular: fold - folded- folded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must fold
you must fold
he must fold
we must fold
you must fold
they must fold 	I must be folding
you must be folding
he must be folding
we must be folding
you must be folding
they must be folding	I must have folded
you must have folded
he must have folded
we must have folded
you must have folded
they must have folded	I must have been folding
you must have been folding
he must have been folding
we must have been folding
you must have been folding
they must have been folding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not fold
you must not fold
he must not fold
we must not fold
you must not fold
they must not fold 	I must not be folding
you must not be folding
he must not be folding
we must not be folding
you must not be folding
they must not be folding	I must not have folded
you must not have folded
he must not have folded
we must not have folded
you must not have folded
they must not have folded	I must not have been folding
you must not have been folding
he must not have been folding
we must not have been folding
you must not have been folding
they must not have been folding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I fold?
must you fold?
must he fold?
must we fold?
must you fold?
must they fold? 	must I be folding?
must you be folding?
must he be folding?
must we be folding?
must you be folding?
must they be folding? 	must I have folded?
must you have folded?
must he have folded?
must we have folded?
must you have folded?
must they have folded? 	must I have been folding?
must you have been folding?
must he have been folding?
must we have been folding?
must you have been folding?
must they have been folding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not fold?
must you not fold?
must he not fold?
must we not fold?
must you not fold?
must they not fold? 	must I not be folding?
must you not be folding?
must he not be folding?
must we not be folding?
must you not be folding?
must they not be folding? 	must I not have folded?
must you not have folded?
must he not have folded?
must we not have folded?
must you not have folded?
must they not have folded? 	must I not have been folding?
must you not have been folding?
must he not have been folding?
must we not have been folding?
must you not have been folding?
must they not have been folding?