I could approve you could approve she could approve we could approve you could approve they could approve
V-ing form
I could be approving you could be approving she could be approving we could be approving you could be approving they could be approving
Perfect
I could have approved you could have approved she could have approved we could have approved you could have approved they could have approved
V-ing perfect
I could have been approving you could have been approving she could have been approving we could have been approving you could have been approving they could have been approving
Negation
Simple form
I could not approve you could not approve she could not approve we could not approve you could not approve they could not approve
V-ing form
I could not be approving you could not be approving she could not be approving we could not be approving you could not be approving they could not be approving
Perfect
I could not have approved you could not have approved she could not have approved we could not have approved you could not have approved they could not have approved
V-ing perfect
I could not have been approving you could not have been approving she could not have been approving we could not have been approving you could not have been approving they could not have been approving
Interrogative form
Simple form
could I approve? could you approve? could she approve? could we approve? could you approve? could they approve?
V-ing form
could I be approving? could you be approving? could she be approving? could we be approving? could you be approving? could they be approving?
Perfect
could I have approved? could you have approved? could she have approved? could we have approved? could you have approved? could they have approved?
V-ing perfect
could I have been approving? could you have been approving? could she have been approving? could we have been approving? could you have been approving? could they have been approving?
Interro-negative form
Simple form
could I not approve? could you not approve? could she not approve? could we not approve? could you not approve? could they not approve?
V-ing form
could I not be approving? could you not be approving? could she not be approving? could we not be approving? could you not be approving? could they not be approving?
Perfect
could I not have approved? could you not have approved? could she not have approved? could we not have approved? could you not have approved? could they not have approved?
V-ing perfect
could I not have been approving? could you not have been approving? could she not have been approving? could we not have been approving? could you not have been approving? could they not have been approving?