I could skate you could skate he could skate we could skate you could skate they could skate
Forme en V-ing
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
I could have skated you could have skated he could have skated we could have skated you could have skated they could have skated
Perfect en V-ing
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
Négation
Forme simple
I couldn't skate you couldn't skate he couldn't skate we couldn't skate you couldn't skate they couldn't skate
Forme en V-ing
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
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
Perfect en V-ing
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
Forme interrogative
Forme simple
could I skate? could you skate? could he skate? could we skate? could you skate? could they skate?
Forme en V-ing
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
could I have skated? could you have skated? could he have skated? could we have skated? could you have skated? could they have skated?
Perfect en V-ing
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?
Forme interro-négative
Forme simple
couldn't I skate? couldn't you skate? couldn't he skate? couldn't we skate? couldn't you skate? couldn't they skate?
Forme en V-ing
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
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?
Perfect en V-ing
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?