English verb conjugation
COULD TERRAFORM

Regular verb: terraform - terraformed - terraformed

Affirmation

Simple form	V-ing form
I could terraform you could terraform he could terraform we could terraform you could terraform they could terraform	I could be terraforming you could be terraforming he could be terraforming we could be terraforming you could be terraforming they could be terraforming
Perfect	V-ing perfect
I could have terraformed you could have terraformed he could have terraformed we could have terraformed you could have terraformed they could have terraformed	I could have been terraforming you could have been terraforming he could have been terraforming we could have been terraforming you could have been terraforming they could have been terraforming

Negation

Simple form	V-ing form
I could not terraform you could not terraform he could not terraform we could not terraform you could not terraform they could not terraform	I could not be terraforming you could not be terraforming he could not be terraforming we could not be terraforming you could not be terraforming they could not be terraforming
Perfect	V-ing perfect
I could not have terraformed you could not have terraformed he could not have terraformed we could not have terraformed you could not have terraformed they could not have terraformed	I could not have been terraforming you could not have been terraforming he could not have been terraforming we could not have been terraforming you could not have been terraforming they could not have been terraforming

Interrogative form

Simple form	V-ing form
could I terraform? could you terraform? could he terraform? could we terraform? could you terraform? could they terraform?	could I be terraforming? could you be terraforming? could he be terraforming? could we be terraforming? could you be terraforming? could they be terraforming?
Perfect	V-ing perfect
could I have terraformed? could you have terraformed? could he have terraformed? could we have terraformed? could you have terraformed? could they have terraformed?	could I have been terraforming? could you have been terraforming? could he have been terraforming? could we have been terraforming? could you have been terraforming? could they have been terraforming?

Interro-negative form

Simple form	V-ing form
could I not terraform? could you not terraform? could he not terraform? could we not terraform? could you not terraform? could they not terraform?	could I not be terraforming? could you not be terraforming? could he not be terraforming? could we not be terraforming? could you not be terraforming? could they not be terraforming?
Perfect	V-ing perfect
could I not have terraformed? could you not have terraformed? could he not have terraformed? could we not have terraformed? could you not have terraformed? could they not have terraformed?	could I not have been terraforming? could you not have been terraforming? could he not have been terraforming? could we not have been terraforming? could you not have been terraforming? could they not have been terraforming?