English verb conjugation
COULD INTERFOLD

Regular verb: interfold - interfolded - interfolded

Affirmation

Simple form	V-ing form
I could interfold you could interfold he could interfold we could interfold you could interfold they could interfold	I could be interfolding you could be interfolding he could be interfolding we could be interfolding you could be interfolding they could be interfolding
Perfect	V-ing perfect
I could have interfolded you could have interfolded he 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 he 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
I couldn't interfold you couldn't interfold he couldn't interfold we couldn't interfold you couldn't interfold they couldn't interfold	I couldn't be interfolding you couldn't be interfolding he couldn't be interfolding we couldn't be interfolding you couldn't be interfolding they couldn't be interfolding
Perfect	V-ing perfect
I couldn't have interfolded you couldn't have interfolded he couldn't have interfolded we couldn't have interfolded you couldn't have interfolded they couldn't have interfolded	I couldn't have been interfolding you couldn't have been interfolding he couldn't have been interfolding we couldn't have been interfolding you couldn't have been interfolding they couldn't have been interfolding

Interrogative form

Simple form	V-ing form
could I interfold? could you interfold? could he interfold? could we interfold? could you interfold? could they interfold?	could I be interfolding? could you be interfolding? could he be interfolding? could we be interfolding? could you be interfolding? could they be interfolding?
Perfect	V-ing perfect
could I have interfolded? could you have interfolded? could he 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 he 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
couldn't I interfold? couldn't you interfold? couldn't he interfold? couldn't we interfold? couldn't you interfold? couldn't they interfold?	couldn't I be interfolding? couldn't you be interfolding? couldn't he be interfolding? couldn't we be interfolding? couldn't you be interfolding? couldn't they be interfolding?
Perfect	V-ing perfect
couldn't I have interfolded? couldn't you have interfolded? couldn't he have interfolded? couldn't we have interfolded? couldn't you have interfolded? couldn't they have interfolded?	couldn't I have been interfolding? couldn't you have been interfolding? couldn't he have been interfolding? couldn't we have been interfolding? couldn't you have been interfolding? couldn't they have been interfolding?