I could remain you could remain she could remain we could remain you could remain they could remain
V-ing form
I could be remaining you could be remaining she could be remaining we could be remaining you could be remaining they could be remaining
Perfect
I could have remained you could have remained she could have remained we could have remained you could have remained they could have remained
V-ing perfect
I could have been remaining you could have been remaining she could have been remaining we could have been remaining you could have been remaining they could have been remaining
Negation
Simple form
I could not remain you could not remain she could not remain we could not remain you could not remain they could not remain
V-ing form
I could not be remaining you could not be remaining she could not be remaining we could not be remaining you could not be remaining they could not be remaining
Perfect
I could not have remained you could not have remained she could not have remained we could not have remained you could not have remained they could not have remained
V-ing perfect
I could not have been remaining you could not have been remaining she could not have been remaining we could not have been remaining you could not have been remaining they could not have been remaining
Interrogative form
Simple form
could I remain? could you remain? could she remain? could we remain? could you remain? could they remain?
V-ing form
could I be remaining? could you be remaining? could she be remaining? could we be remaining? could you be remaining? could they be remaining?
Perfect
could I have remained? could you have remained? could she have remained? could we have remained? could you have remained? could they have remained?
V-ing perfect
could I have been remaining? could you have been remaining? could she have been remaining? could we have been remaining? could you have been remaining? could they have been remaining?
Interro-negative form
Simple form
could I not remain? could you not remain? could she not remain? could we not remain? could you not remain? could they not remain?
V-ing form
could I not be remaining? could you not be remaining? could she not be remaining? could we not be remaining? could you not be remaining? could they not be remaining?
Perfect
could I not have remained? could you not have remained? could she not have remained? could we not have remained? could you not have remained? could they not have remained?
V-ing perfect
could I not have been remaining? could you not have been remaining? could she not have been remaining? could we not have been remaining? could you not have been remaining? could they not have been remaining?