I could floor you could floor he could floor we could floor you could floor they could floor
V-ing form
I could be flooring you could be flooring he could be flooring we could be flooring you could be flooring they could be flooring
Perfect
I could have floored you could have floored he could have floored we could have floored you could have floored they could have floored
V-ing perfect
I could have been flooring you could have been flooring he could have been flooring we could have been flooring you could have been flooring they could have been flooring
Negation
Simple form
I couldn't floor you couldn't floor he couldn't floor we couldn't floor you couldn't floor they couldn't floor
V-ing form
I couldn't be flooring you couldn't be flooring he couldn't be flooring we couldn't be flooring you couldn't be flooring they couldn't be flooring
Perfect
I couldn't have floored you couldn't have floored he couldn't have floored we couldn't have floored you couldn't have floored they couldn't have floored
V-ing perfect
I couldn't have been flooring you couldn't have been flooring he couldn't have been flooring we couldn't have been flooring you couldn't have been flooring they couldn't have been flooring
Interrogative form
Simple form
could I floor? could you floor? could he floor? could we floor? could you floor? could they floor?
V-ing form
could I be flooring? could you be flooring? could he be flooring? could we be flooring? could you be flooring? could they be flooring?
Perfect
could I have floored? could you have floored? could he have floored? could we have floored? could you have floored? could they have floored?
V-ing perfect
could I have been flooring? could you have been flooring? could he have been flooring? could we have been flooring? could you have been flooring? could they have been flooring?
Interro-negative form
Simple form
couldn't I floor? couldn't you floor? couldn't he floor? couldn't we floor? couldn't you floor? couldn't they floor?
V-ing form
couldn't I be flooring? couldn't you be flooring? couldn't he be flooring? couldn't we be flooring? couldn't you be flooring? couldn't they be flooring?
Perfect
couldn't I have floored? couldn't you have floored? couldn't he have floored? couldn't we have floored? couldn't you have floored? couldn't they have floored?
V-ing perfect
couldn't I have been flooring? couldn't you have been flooring? couldn't he have been flooring? couldn't we have been flooring? couldn't you have been flooring? couldn't they have been flooring?