I could leap you could leap he could leap we could leap you could leap they could leap
V-ing form
I could be leaping you could be leaping he could be leaping we could be leaping you could be leaping they could be leaping
Perfect
I could have leapt, leaped you could have leapt, leaped he could have leapt, leaped we could have leapt, leaped you could have leapt, leaped they could have leapt, leaped
V-ing perfect
I could have been leaping you could have been leaping he could have been leaping we could have been leaping you could have been leaping they could have been leaping
Negation
Simple form
I couldn't leap you couldn't leap he couldn't leap we couldn't leap you couldn't leap they couldn't leap
V-ing form
I couldn't be leaping you couldn't be leaping he couldn't be leaping we couldn't be leaping you couldn't be leaping they couldn't be leaping
Perfect
I couldn't have leapt, leaped you couldn't have leapt, leaped he couldn't have leapt, leaped we couldn't have leapt, leaped you couldn't have leapt, leaped they couldn't have leapt, leaped
V-ing perfect
I couldn't have been leaping you couldn't have been leaping he couldn't have been leaping we couldn't have been leaping you couldn't have been leaping they couldn't have been leaping
Interrogative form
Simple form
could I leap? could you leap? could he leap? could we leap? could you leap? could they leap?
V-ing form
could I be leaping? could you be leaping? could he be leaping? could we be leaping? could you be leaping? could they be leaping?
Perfect
could I have leapt, leaped? could you have leapt, leaped? could he have leapt, leaped? could we have leapt, leaped? could you have leapt, leaped? could they have leapt, leaped?
V-ing perfect
could I have been leaping? could you have been leaping? could he have been leaping? could we have been leaping? could you have been leaping? could they have been leaping?
Interro-negative form
Simple form
couldn't I leap? couldn't you leap? couldn't he leap? couldn't we leap? couldn't you leap? couldn't they leap?
V-ing form
couldn't I be leaping? couldn't you be leaping? couldn't he be leaping? couldn't we be leaping? couldn't you be leaping? couldn't they be leaping?
Perfect
couldn't I have leapt, leaped? couldn't you have leapt, leaped? couldn't he have leapt, leaped? couldn't we have leapt, leaped? couldn't you have leapt, leaped? couldn't they have leapt, leaped?
V-ing perfect
couldn't I have been leaping? couldn't you have been leaping? couldn't he have been leaping? couldn't we have been leaping? couldn't you have been leaping? couldn't they have been leaping?