could interfold
Regular verb: interfold - interfolded- interfolded

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

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

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

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