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