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

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I couldn't stiff-arm
you couldn't stiff-arm
he couldn't stiff-arm
we couldn't stiff-arm
you couldn't stiff-arm
they couldn't stiff-arm 	I couldn't be stiff-arming
you couldn't be stiff-arming
he couldn't be stiff-arming
we couldn't be stiff-arming
you couldn't be stiff-arming
they couldn't be stiff-arming	I couldn't have stiff-armed
you couldn't have stiff-armed
he couldn't have stiff-armed
we couldn't have stiff-armed
you couldn't have stiff-armed
they couldn't have stiff-armed	I couldn't have been stiff-arming
you couldn't have been stiff-arming
he couldn't have been stiff-arming
we couldn't have been stiff-arming
you couldn't have been stiff-arming
they couldn't have been stiff-arming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
couldn't I stiff-arm?
couldn't you stiff-arm?
couldn't he stiff-arm?
couldn't we stiff-arm?
couldn't you stiff-arm?
couldn't they stiff-arm? 	couldn't I be stiff-arming?
couldn't you be stiff-arming?
couldn't he be stiff-arming?
couldn't we be stiff-arming?
couldn't you be stiff-arming?
couldn't they be stiff-arming? 	couldn't I have stiff-armed?
couldn't you have stiff-armed?
couldn't he have stiff-armed?
couldn't we have stiff-armed?
couldn't you have stiff-armed?
couldn't they have stiff-armed? 	couldn't I have been stiff-arming?
couldn't you have been stiff-arming?
couldn't he have been stiff-arming?
couldn't we have been stiff-arming?
couldn't you have been stiff-arming?
couldn't they have been stiff-arming?