English verb conjugation
COULD ICE-SKATE

Regular verb: ice-skate - ice-skated - ice-skated

Affirmation

Simple form	V-ing form
I could ice-skate you could ice-skate he could ice-skate we could ice-skate you could ice-skate they could ice-skate	I could be ice-skating you could be ice-skating he could be ice-skating we could be ice-skating you could be ice-skating they could be ice-skating
Perfect	V-ing perfect
I could have ice-skated you could have ice-skated he could have ice-skated we could have ice-skated you could have ice-skated they could have ice-skated	I could have been ice-skating you could have been ice-skating he could have been ice-skating we could have been ice-skating you could have been ice-skating they could have been ice-skating

Negation

Simple form	V-ing form
I could not ice-skate you could not ice-skate he could not ice-skate we could not ice-skate you could not ice-skate they could not ice-skate	I could not be ice-skating you could not be ice-skating he could not be ice-skating we could not be ice-skating you could not be ice-skating they could not be ice-skating
Perfect	V-ing perfect
I could not have ice-skated you could not have ice-skated he could not have ice-skated we could not have ice-skated you could not have ice-skated they could not have ice-skated	I could not have been ice-skating you could not have been ice-skating he could not have been ice-skating we could not have been ice-skating you could not have been ice-skating they could not have been ice-skating

Interrogative form

Simple form	V-ing form
could I ice-skate? could you ice-skate? could he ice-skate? could we ice-skate? could you ice-skate? could they ice-skate?	could I be ice-skating? could you be ice-skating? could he be ice-skating? could we be ice-skating? could you be ice-skating? could they be ice-skating?
Perfect	V-ing perfect
could I have ice-skated? could you have ice-skated? could he have ice-skated? could we have ice-skated? could you have ice-skated? could they have ice-skated?	could I have been ice-skating? could you have been ice-skating? could he have been ice-skating? could we have been ice-skating? could you have been ice-skating? could they have been ice-skating?

Interro-negative form

Simple form	V-ing form
could I not ice-skate? could you not ice-skate? could he not ice-skate? could we not ice-skate? could you not ice-skate? could they not ice-skate?	could I not be ice-skating? could you not be ice-skating? could he not be ice-skating? could we not be ice-skating? could you not be ice-skating? could they not be ice-skating?
Perfect	V-ing perfect
could I not have ice-skated? could you not have ice-skated? could he not have ice-skated? could we not have ice-skated? could you not have ice-skated? could they not have ice-skated?	could I not have been ice-skating? could you not have been ice-skating? could he not have been ice-skating? could we not have been ice-skating? could you not have been ice-skating? could they not have been ice-skating?