Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could cover cover you could cover cover he could cover cover we could cover cover you could cover cover they could cover cover
V-ing form
I could be cover covering you could be cover covering he could be cover covering we could be cover covering you could be cover covering they could be cover covering
Perfect
I could have cover covered you could have cover covered he could have cover covered we could have cover covered you could have cover covered they could have cover covered
V-ing perfect
I could have been cover covering you could have been cover covering he could have been cover covering we could have been cover covering you could have been cover covering they could have been cover covering
Negation
Simple form
I couldn't cover cover you couldn't cover cover he couldn't cover cover we couldn't cover cover you couldn't cover cover they couldn't cover cover
V-ing form
I couldn't be cover covering you couldn't be cover covering he couldn't be cover covering we couldn't be cover covering you couldn't be cover covering they couldn't be cover covering
Perfect
I couldn't have cover covered you couldn't have cover covered he couldn't have cover covered we couldn't have cover covered you couldn't have cover covered they couldn't have cover covered
V-ing perfect
I couldn't have been cover covering you couldn't have been cover covering he couldn't have been cover covering we couldn't have been cover covering you couldn't have been cover covering they couldn't have been cover covering
Interrogative form
Simple form
could I cover cover? could you cover cover? could he cover cover? could we cover cover? could you cover cover? could they cover cover?
V-ing form
could I be cover covering? could you be cover covering? could he be cover covering? could we be cover covering? could you be cover covering? could they be cover covering?
Perfect
could I have cover covered? could you have cover covered? could he have cover covered? could we have cover covered? could you have cover covered? could they have cover covered?
V-ing perfect
could I have been cover covering? could you have been cover covering? could he have been cover covering? could we have been cover covering? could you have been cover covering? could they have been cover covering?
Interro-negative form
Simple form
couldn't I cover cover? couldn't you cover cover? couldn't he cover cover? couldn't we cover cover? couldn't you cover cover? couldn't they cover cover?
V-ing form
couldn't I be cover covering? couldn't you be cover covering? couldn't he be cover covering? couldn't we be cover covering? couldn't you be cover covering? couldn't they be cover covering?
Perfect
couldn't I have cover covered? couldn't you have cover covered? couldn't he have cover covered? couldn't we have cover covered? couldn't you have cover covered? couldn't they have cover covered?
V-ing perfect
couldn't I have been cover covering? couldn't you have been cover covering? couldn't he have been cover covering? couldn't we have been cover covering? couldn't you have been cover covering? couldn't they have been cover covering?