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