I could bucket you could bucket she could bucket we could bucket you could bucket they could bucket
V-ing form
I could be bucketing you could be bucketing she could be bucketing we could be bucketing you could be bucketing they could be bucketing
Perfect
I could have bucketed you could have bucketed she 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 she 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 she 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 she 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 she 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 she 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 she bucket? could we bucket? could you bucket? could they bucket?
V-ing form
could I be bucketing? could you be bucketing? could she be bucketing? could we be bucketing? could you be bucketing? could they be bucketing?
Perfect
could I have bucketed? could you have bucketed? could she 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 she 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 she 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 she 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 she 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 she have been bucketing? couldn't we have been bucketing? couldn't you have been bucketing? couldn't they have been bucketing?