I could oblige you could oblige she could oblige we could oblige you could oblige they could oblige
V-ing form
I could be obliging you could be obliging she could be obliging we could be obliging you could be obliging they could be obliging
Perfect
I could have obliged you could have obliged she could have obliged we could have obliged you could have obliged they could have obliged
V-ing perfect
I could have been obliging you could have been obliging she could have been obliging we could have been obliging you could have been obliging they could have been obliging
Negation
Simple form
I could not oblige you could not oblige she could not oblige we could not oblige you could not oblige they could not oblige
V-ing form
I could not be obliging you could not be obliging she could not be obliging we could not be obliging you could not be obliging they could not be obliging
Perfect
I could not have obliged you could not have obliged she could not have obliged we could not have obliged you could not have obliged they could not have obliged
V-ing perfect
I could not have been obliging you could not have been obliging she could not have been obliging we could not have been obliging you could not have been obliging they could not have been obliging
Interrogative form
Simple form
could I oblige? could you oblige? could she oblige? could we oblige? could you oblige? could they oblige?
V-ing form
could I be obliging? could you be obliging? could she be obliging? could we be obliging? could you be obliging? could they be obliging?
Perfect
could I have obliged? could you have obliged? could she have obliged? could we have obliged? could you have obliged? could they have obliged?
V-ing perfect
could I have been obliging? could you have been obliging? could she have been obliging? could we have been obliging? could you have been obliging? could they have been obliging?
Interro-negative form
Simple form
could I not oblige? could you not oblige? could she not oblige? could we not oblige? could you not oblige? could they not oblige?
V-ing form
could I not be obliging? could you not be obliging? could she not be obliging? could we not be obliging? could you not be obliging? could they not be obliging?
Perfect
could I not have obliged? could you not have obliged? could she not have obliged? could we not have obliged? could you not have obliged? could they not have obliged?
V-ing perfect
could I not have been obliging? could you not have been obliging? could she not have been obliging? could we not have been obliging? could you not have been obliging? could they not have been obliging?