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