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 couldn't ice-skate you couldn't ice-skate he couldn't ice-skate we couldn't ice-skate you couldn't ice-skate they couldn't ice-skate	I couldn't be ice-skating you couldn't be ice-skating he couldn't be ice-skating we couldn't be ice-skating you couldn't be ice-skating they couldn't be ice-skating
Perfect	V-ing perfect
I couldn't have ice-skated you couldn't have ice-skated he couldn't have ice-skated we couldn't have ice-skated you couldn't have ice-skated they couldn't have ice-skated	I couldn't have been ice-skating you couldn't have been ice-skating he couldn't have been ice-skating we couldn't have been ice-skating you couldn't have been ice-skating they couldn't 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
couldn't I ice-skate? couldn't you ice-skate? couldn't he ice-skate? couldn't we ice-skate? couldn't you ice-skate? couldn't they ice-skate?	couldn't I be ice-skating? couldn't you be ice-skating? couldn't he be ice-skating? couldn't we be ice-skating? couldn't you be ice-skating? couldn't they be ice-skating?
Perfect	V-ing perfect
couldn't I have ice-skated? couldn't you have ice-skated? couldn't he have ice-skated? couldn't we have ice-skated? couldn't you have ice-skated? couldn't they have ice-skated?	couldn't I have been ice-skating? couldn't you have been ice-skating? couldn't he have been ice-skating? couldn't we have been ice-skating? couldn't you have been ice-skating? couldn't they have been ice-skating?