I could wester you could wester he could wester we could wester you could wester they could wester
V-ing form
I could be westering you could be westering he could be westering we could be westering you could be westering they could be westering
Perfect
I could have westered you could have westered he could have westered we could have westered you could have westered they could have westered
V-ing perfect
I could have been westering you could have been westering he could have been westering we could have been westering you could have been westering they could have been westering
Negation
Simple form
I could not wester you could not wester he could not wester we could not wester you could not wester they could not wester
V-ing form
I could not be westering you could not be westering he could not be westering we could not be westering you could not be westering they could not be westering
Perfect
I could not have westered you could not have westered he could not have westered we could not have westered you could not have westered they could not have westered
V-ing perfect
I could not have been westering you could not have been westering he could not have been westering we could not have been westering you could not have been westering they could not have been westering
Interrogative form
Simple form
could I wester? could you wester? could he wester? could we wester? could you wester? could they wester?
V-ing form
could I be westering? could you be westering? could he be westering? could we be westering? could you be westering? could they be westering?
Perfect
could I have westered? could you have westered? could he have westered? could we have westered? could you have westered? could they have westered?
V-ing perfect
could I have been westering? could you have been westering? could he have been westering? could we have been westering? could you have been westering? could they have been westering?
Interro-negative form
Simple form
could I not wester? could you not wester? could he not wester? could we not wester? could you not wester? could they not wester?
V-ing form
could I not be westering? could you not be westering? could he not be westering? could we not be westering? could you not be westering? could they not be westering?
Perfect
could I not have westered? could you not have westered? could he not have westered? could we not have westered? could you not have westered? could they not have westered?
V-ing perfect
could I not have been westering? could you not have been westering? could he not have been westering? could we not have been westering? could you not have been westering? could they not have been westering?