English verb conjugation
COULD SKATE

Regular verb: skate - skated - skated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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