must interfold
Regular verb: interfold - interfolded- interfolded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must interfold
you must interfold
she must interfold
we must interfold
you must interfold
they must interfold 	I must be interfolding
you must be interfolding
she must be interfolding
we must be interfolding
you must be interfolding
they must be interfolding	I must have interfolded
you must have interfolded
she 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
she must have been interfolding
we must have been interfolding
you must have been interfolding
they must have been interfolding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not interfold
you must not interfold
she 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
she 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
she 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
she must not have been interfolding
we must not have been interfolding
you must not have been interfolding
they must not have been interfolding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I interfold?
must you interfold?
must she interfold?
must we interfold?
must you interfold?
must they interfold? 	must I be interfolding?
must you be interfolding?
must she be interfolding?
must we be interfolding?
must you be interfolding?
must they be interfolding? 	must I have interfolded?
must you have interfolded?
must she 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 she have been interfolding?
must we have been interfolding?
must you have been interfolding?
must they have been interfolding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not interfold?
must you not interfold?
must she 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 she 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 she 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 she not have been interfolding?
must we not have been interfolding?
must you not have been interfolding?
must they not have been interfolding?