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