I could owe you could owe she could owe we could owe you could owe they could owe
V-ing form
I could be owing you could be owing she could be owing we could be owing you could be owing they could be owing
Perfect
I could have owed you could have owed she could have owed we could have owed you could have owed they could have owed
V-ing perfect
I could have been owing you could have been owing she could have been owing we could have been owing you could have been owing they could have been owing
Negation
Simple form
I couldn't owe you couldn't owe she couldn't owe we couldn't owe you couldn't owe they couldn't owe
V-ing form
I couldn't be owing you couldn't be owing she couldn't be owing we couldn't be owing you couldn't be owing they couldn't be owing
Perfect
I couldn't have owed you couldn't have owed she couldn't have owed we couldn't have owed you couldn't have owed they couldn't have owed
V-ing perfect
I couldn't have been owing you couldn't have been owing she couldn't have been owing we couldn't have been owing you couldn't have been owing they couldn't have been owing
Interrogative form
Simple form
could I owe? could you owe? could she owe? could we owe? could you owe? could they owe?
V-ing form
could I be owing? could you be owing? could she be owing? could we be owing? could you be owing? could they be owing?
Perfect
could I have owed? could you have owed? could she have owed? could we have owed? could you have owed? could they have owed?
V-ing perfect
could I have been owing? could you have been owing? could she have been owing? could we have been owing? could you have been owing? could they have been owing?
Interro-negative form
Simple form
couldn't I owe? couldn't you owe? couldn't she owe? couldn't we owe? couldn't you owe? couldn't they owe?
V-ing form
couldn't I be owing? couldn't you be owing? couldn't she be owing? couldn't we be owing? couldn't you be owing? couldn't they be owing?
Perfect
couldn't I have owed? couldn't you have owed? couldn't she have owed? couldn't we have owed? couldn't you have owed? couldn't they have owed?
V-ing perfect
couldn't I have been owing? couldn't you have been owing? couldn't she have been owing? couldn't we have been owing? couldn't you have been owing? couldn't they have been owing?