must interfold
Verbo regular: interfold - interfolded- interfolded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must interfold
you must interfold
he must interfold
we must interfold
you must interfold
they must interfold 	I must be interfolding
you must be interfolding
he must be interfolding
we must be interfolding
you must be interfolding
they must be interfolding	I must have interfolded
you must have interfolded
he must have interfolded
we must have interfolded
you must have interfolded
they must have interfolded	I must have been interfolding
you must have been interfolding
he must have been interfolding
we must have been interfolding
you must have been interfolding
they must have been interfolding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not interfold
you must not interfold
he must not interfold
we must not interfold
you must not interfold
they must not interfold 	I must not be interfolding
you must not be interfolding
he must not be interfolding
we must not be interfolding
you must not be interfolding
they must not be interfolding	I must not have interfolded
you must not have interfolded
he must not have interfolded
we must not have interfolded
you must not have interfolded
they must not have interfolded	I must not have been interfolding
you must not have been interfolding
he must not have been interfolding
we must not have been interfolding
you must not have been interfolding
they must not have been interfolding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I interfold?
must you interfold?
must he interfold?
must we interfold?
must you interfold?
must they interfold? 	must I be interfolding?
must you be interfolding?
must he be interfolding?
must we be interfolding?
must you be interfolding?
must they be interfolding? 	must I have interfolded?
must you have interfolded?
must he have interfolded?
must we have interfolded?
must you have interfolded?
must they have interfolded? 	must I have been interfolding?
must you have been interfolding?
must he have been interfolding?
must we have been interfolding?
must you have been interfolding?
must they have been interfolding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not interfold?
must you not interfold?
must he not interfold?
must we not interfold?
must you not interfold?
must they not interfold? 	must I not be interfolding?
must you not be interfolding?
must he not be interfolding?
must we not be interfolding?
must you not be interfolding?
must they not be interfolding? 	must I not have interfolded?
must you not have interfolded?
must he not have interfolded?
must we not have interfolded?
must you not have interfolded?
must they not have interfolded? 	must I not have been interfolding?
must you not have been interfolding?
must he not have been interfolding?
must we not have been interfolding?
must you not have been interfolding?
must they not have been interfolding?