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