could thermoform
Regular verb: thermoform - thermoformed- thermoformed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thermoform
you could thermoform
he could thermoform
we could thermoform
you could thermoform
they could thermoform 	I could be thermoforming
you could be thermoforming
he could be thermoforming
we could be thermoforming
you could be thermoforming
they could be thermoforming	I could have thermoformed
you could have thermoformed
he could have thermoformed
we could have thermoformed
you could have thermoformed
they could have thermoformed	I could have been thermoforming
you could have been thermoforming
he could have been thermoforming
we could have been thermoforming
you could have been thermoforming
they could have been thermoforming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't thermoform
you couldn't thermoform
he couldn't thermoform
we couldn't thermoform
you couldn't thermoform
they couldn't thermoform 	I couldn't be thermoforming
you couldn't be thermoforming
he couldn't be thermoforming
we couldn't be thermoforming
you couldn't be thermoforming
they couldn't be thermoforming	I couldn't have thermoformed
you couldn't have thermoformed
he couldn't have thermoformed
we couldn't have thermoformed
you couldn't have thermoformed
they couldn't have thermoformed	I couldn't have been thermoforming
you couldn't have been thermoforming
he couldn't have been thermoforming
we couldn't have been thermoforming
you couldn't have been thermoforming
they couldn't have been thermoforming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I thermoform?
could you thermoform?
could he thermoform?
could we thermoform?
could you thermoform?
could they thermoform? 	could I be thermoforming?
could you be thermoforming?
could he be thermoforming?
could we be thermoforming?
could you be thermoforming?
could they be thermoforming? 	could I have thermoformed?
could you have thermoformed?
could he have thermoformed?
could we have thermoformed?
could you have thermoformed?
could they have thermoformed? 	could I have been thermoforming?
could you have been thermoforming?
could he have been thermoforming?
could we have been thermoforming?
could you have been thermoforming?
could they have been thermoforming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I thermoform?
couldn't you thermoform?
couldn't he thermoform?
couldn't we thermoform?
couldn't you thermoform?
couldn't they thermoform? 	couldn't I be thermoforming?
couldn't you be thermoforming?
couldn't he be thermoforming?
couldn't we be thermoforming?
couldn't you be thermoforming?
couldn't they be thermoforming? 	couldn't I have thermoformed?
couldn't you have thermoformed?
couldn't he have thermoformed?
couldn't we have thermoformed?
couldn't you have thermoformed?
couldn't they have thermoformed? 	couldn't I have been thermoforming?
couldn't you have been thermoforming?
couldn't he have been thermoforming?
couldn't we have been thermoforming?
couldn't you have been thermoforming?
couldn't they have been thermoforming?