I could uncase you could uncase she could uncase we could uncase you could uncase they could uncase
V-ing form
I could be uncasing you could be uncasing she could be uncasing we could be uncasing you could be uncasing they could be uncasing
Perfect
I could have uncased you could have uncased she could have uncased we could have uncased you could have uncased they could have uncased
V-ing perfect
I could have been uncasing you could have been uncasing she could have been uncasing we could have been uncasing you could have been uncasing they could have been uncasing
Negation
Simple form
I could not uncase you could not uncase she could not uncase we could not uncase you could not uncase they could not uncase
V-ing form
I could not be uncasing you could not be uncasing she could not be uncasing we could not be uncasing you could not be uncasing they could not be uncasing
Perfect
I could not have uncased you could not have uncased she could not have uncased we could not have uncased you could not have uncased they could not have uncased
V-ing perfect
I could not have been uncasing you could not have been uncasing she could not have been uncasing we could not have been uncasing you could not have been uncasing they could not have been uncasing
Interrogative form
Simple form
could I uncase? could you uncase? could she uncase? could we uncase? could you uncase? could they uncase?
V-ing form
could I be uncasing? could you be uncasing? could she be uncasing? could we be uncasing? could you be uncasing? could they be uncasing?
Perfect
could I have uncased? could you have uncased? could she have uncased? could we have uncased? could you have uncased? could they have uncased?
V-ing perfect
could I have been uncasing? could you have been uncasing? could she have been uncasing? could we have been uncasing? could you have been uncasing? could they have been uncasing?
Interro-negative form
Simple form
could I not uncase? could you not uncase? could she not uncase? could we not uncase? could you not uncase? could they not uncase?
V-ing form
could I not be uncasing? could you not be uncasing? could she not be uncasing? could we not be uncasing? could you not be uncasing? could they not be uncasing?
Perfect
could I not have uncased? could you not have uncased? could she not have uncased? could we not have uncased? could you not have uncased? could they not have uncased?
V-ing perfect
could I not have been uncasing? could you not have been uncasing? could she not have been uncasing? could we not have been uncasing? could you not have been uncasing? could they not have been uncasing?