could mass-produce
Regular verb: mass-produce - mass-produced- mass-produced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could mass-produce
you could mass-produce
he could mass-produce
we could mass-produce
you could mass-produce
they could mass-produce 	I could be mass-producing
you could be mass-producing
he could be mass-producing
we could be mass-producing
you could be mass-producing
they could be mass-producing	I could have mass-produced
you could have mass-produced
he could have mass-produced
we could have mass-produced
you could have mass-produced
they could have mass-produced	I could have been mass-producing
you could have been mass-producing
he could have been mass-producing
we could have been mass-producing
you could have been mass-producing
they could have been mass-producing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not mass-produce
you could not mass-produce
he could not mass-produce
we could not mass-produce
you could not mass-produce
they could not mass-produce 	I could not be mass-producing
you could not be mass-producing
he could not be mass-producing
we could not be mass-producing
you could not be mass-producing
they could not be mass-producing	I could not have mass-produced
you could not have mass-produced
he could not have mass-produced
we could not have mass-produced
you could not have mass-produced
they could not have mass-produced	I could not have been mass-producing
you could not have been mass-producing
he could not have been mass-producing
we could not have been mass-producing
you could not have been mass-producing
they could not have been mass-producing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I mass-produce?
could you mass-produce?
could he mass-produce?
could we mass-produce?
could you mass-produce?
could they mass-produce? 	could I be mass-producing?
could you be mass-producing?
could he be mass-producing?
could we be mass-producing?
could you be mass-producing?
could they be mass-producing? 	could I have mass-produced?
could you have mass-produced?
could he have mass-produced?
could we have mass-produced?
could you have mass-produced?
could they have mass-produced? 	could I have been mass-producing?
could you have been mass-producing?
could he have been mass-producing?
could we have been mass-producing?
could you have been mass-producing?
could they have been mass-producing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not mass-produce?
could you not mass-produce?
could he not mass-produce?
could we not mass-produce?
could you not mass-produce?
could they not mass-produce? 	could I not be mass-producing?
could you not be mass-producing?
could he not be mass-producing?
could we not be mass-producing?
could you not be mass-producing?
could they not be mass-producing? 	could I not have mass-produced?
could you not have mass-produced?
could he not have mass-produced?
could we not have mass-produced?
could you not have mass-produced?
could they not have mass-produced? 	could I not have been mass-producing?
could you not have been mass-producing?
could he not have been mass-producing?
could we not have been mass-producing?
could you not have been mass-producing?
could they not have been mass-producing?