English verb conjugation
COULD STIFF-ARM

Regular verb: stiff-arm - stiff-armed - stiff-armed

Affirmation

Simple form	V-ing form
I could stiff-arm you could stiff-arm he could stiff-arm we could stiff-arm you could stiff-arm they could stiff-arm	I could be stiff-arming you could be stiff-arming he could be stiff-arming we could be stiff-arming you could be stiff-arming they could be stiff-arming
Perfect	V-ing perfect
I could have stiff-armed you could have stiff-armed he could have stiff-armed we could have stiff-armed you could have stiff-armed they could have stiff-armed	I could have been stiff-arming you could have been stiff-arming he could have been stiff-arming we could have been stiff-arming you could have been stiff-arming they could have been stiff-arming

Negation

Simple form	V-ing form
I could not stiff-arm you could not stiff-arm he could not stiff-arm we could not stiff-arm you could not stiff-arm they could not stiff-arm	I could not be stiff-arming you could not be stiff-arming he could not be stiff-arming we could not be stiff-arming you could not be stiff-arming they could not be stiff-arming
Perfect	V-ing perfect
I could not have stiff-armed you could not have stiff-armed he could not have stiff-armed we could not have stiff-armed you could not have stiff-armed they could not have stiff-armed	I could not have been stiff-arming you could not have been stiff-arming he could not have been stiff-arming we could not have been stiff-arming you could not have been stiff-arming they could not have been stiff-arming

Interrogative form

Simple form	V-ing form
could I stiff-arm? could you stiff-arm? could he stiff-arm? could we stiff-arm? could you stiff-arm? could they stiff-arm?	could I be stiff-arming? could you be stiff-arming? could he be stiff-arming? could we be stiff-arming? could you be stiff-arming? could they be stiff-arming?
Perfect	V-ing perfect
could I have stiff-armed? could you have stiff-armed? could he have stiff-armed? could we have stiff-armed? could you have stiff-armed? could they have stiff-armed?	could I have been stiff-arming? could you have been stiff-arming? could he have been stiff-arming? could we have been stiff-arming? could you have been stiff-arming? could they have been stiff-arming?

Interro-negative form

Simple form	V-ing form
could I not stiff-arm? could you not stiff-arm? could he not stiff-arm? could we not stiff-arm? could you not stiff-arm? could they not stiff-arm?	could I not be stiff-arming? could you not be stiff-arming? could he not be stiff-arming? could we not be stiff-arming? could you not be stiff-arming? could they not be stiff-arming?
Perfect	V-ing perfect
could I not have stiff-armed? could you not have stiff-armed? could he not have stiff-armed? could we not have stiff-armed? could you not have stiff-armed? could they not have stiff-armed?	could I not have been stiff-arming? could you not have been stiff-arming? could he not have been stiff-arming? could we not have been stiff-arming? could you not have been stiff-arming? could they not have been stiff-arming?