I could hurrah you could hurrah he could hurrah we could hurrah you could hurrah they could hurrah
V-ing form
I could be hurrahing you could be hurrahing he could be hurrahing we could be hurrahing you could be hurrahing they could be hurrahing
Perfect
I could have hurrahed you could have hurrahed he could have hurrahed we could have hurrahed you could have hurrahed they could have hurrahed
V-ing perfect
I could have been hurrahing you could have been hurrahing he could have been hurrahing we could have been hurrahing you could have been hurrahing they could have been hurrahing
Negation
Simple form
I could not hurrah you could not hurrah he could not hurrah we could not hurrah you could not hurrah they could not hurrah
V-ing form
I could not be hurrahing you could not be hurrahing he could not be hurrahing we could not be hurrahing you could not be hurrahing they could not be hurrahing
Perfect
I could not have hurrahed you could not have hurrahed he could not have hurrahed we could not have hurrahed you could not have hurrahed they could not have hurrahed
V-ing perfect
I could not have been hurrahing you could not have been hurrahing he could not have been hurrahing we could not have been hurrahing you could not have been hurrahing they could not have been hurrahing
Interrogative form
Simple form
could I hurrah? could you hurrah? could he hurrah? could we hurrah? could you hurrah? could they hurrah?
V-ing form
could I be hurrahing? could you be hurrahing? could he be hurrahing? could we be hurrahing? could you be hurrahing? could they be hurrahing?
Perfect
could I have hurrahed? could you have hurrahed? could he have hurrahed? could we have hurrahed? could you have hurrahed? could they have hurrahed?
V-ing perfect
could I have been hurrahing? could you have been hurrahing? could he have been hurrahing? could we have been hurrahing? could you have been hurrahing? could they have been hurrahing?
Interro-negative form
Simple form
could I not hurrah? could you not hurrah? could he not hurrah? could we not hurrah? could you not hurrah? could they not hurrah?
V-ing form
could I not be hurrahing? could you not be hurrahing? could he not be hurrahing? could we not be hurrahing? could you not be hurrahing? could they not be hurrahing?
Perfect
could I not have hurrahed? could you not have hurrahed? could he not have hurrahed? could we not have hurrahed? could you not have hurrahed? could they not have hurrahed?
V-ing perfect
could I not have been hurrahing? could you not have been hurrahing? could he not have been hurrahing? could we not have been hurrahing? could you not have been hurrahing? could they not have been hurrahing?