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