I could abrade you could abrade she could abrade we could abrade you could abrade they could abrade
V-ing form
I could be abrading you could be abrading she could be abrading we could be abrading you could be abrading they could be abrading
Perfect
I could have abraded you could have abraded she could have abraded we could have abraded you could have abraded they could have abraded
V-ing perfect
I could have been abrading you could have been abrading she could have been abrading we could have been abrading you could have been abrading they could have been abrading
Negation
Simple form
I could not abrade you could not abrade she could not abrade we could not abrade you could not abrade they could not abrade
V-ing form
I could not be abrading you could not be abrading she could not be abrading we could not be abrading you could not be abrading they could not be abrading
Perfect
I could not have abraded you could not have abraded she could not have abraded we could not have abraded you could not have abraded they could not have abraded
V-ing perfect
I could not have been abrading you could not have been abrading she could not have been abrading we could not have been abrading you could not have been abrading they could not have been abrading
Interrogative form
Simple form
could I abrade? could you abrade? could she abrade? could we abrade? could you abrade? could they abrade?
V-ing form
could I be abrading? could you be abrading? could she be abrading? could we be abrading? could you be abrading? could they be abrading?
Perfect
could I have abraded? could you have abraded? could she have abraded? could we have abraded? could you have abraded? could they have abraded?
V-ing perfect
could I have been abrading? could you have been abrading? could she have been abrading? could we have been abrading? could you have been abrading? could they have been abrading?
Interro-negative form
Simple form
could I not abrade? could you not abrade? could she not abrade? could we not abrade? could you not abrade? could they not abrade?
V-ing form
could I not be abrading? could you not be abrading? could she not be abrading? could we not be abrading? could you not be abrading? could they not be abrading?
Perfect
could I not have abraded? could you not have abraded? could she not have abraded? could we not have abraded? could you not have abraded? could they not have abraded?
V-ing perfect
could I not have been abrading? could you not have been abrading? could she not have been abrading? could we not have been abrading? could you not have been abrading? could they not have been abrading?