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