I could dump you could dump he could dump we could dump you could dump they could dump
V-ing form
I could be dumping you could be dumping he could be dumping we could be dumping you could be dumping they could be dumping
Perfect
I could have dumped you could have dumped he could have dumped we could have dumped you could have dumped they could have dumped
V-ing perfect
I could have been dumping you could have been dumping he could have been dumping we could have been dumping you could have been dumping they could have been dumping
Negation
Simple form
I could not dump you could not dump he could not dump we could not dump you could not dump they could not dump
V-ing form
I could not be dumping you could not be dumping he could not be dumping we could not be dumping you could not be dumping they could not be dumping
Perfect
I could not have dumped you could not have dumped he could not have dumped we could not have dumped you could not have dumped they could not have dumped
V-ing perfect
I could not have been dumping you could not have been dumping he could not have been dumping we could not have been dumping you could not have been dumping they could not have been dumping
Interrogative form
Simple form
could I dump? could you dump? could he dump? could we dump? could you dump? could they dump?
V-ing form
could I be dumping? could you be dumping? could he be dumping? could we be dumping? could you be dumping? could they be dumping?
Perfect
could I have dumped? could you have dumped? could he have dumped? could we have dumped? could you have dumped? could they have dumped?
V-ing perfect
could I have been dumping? could you have been dumping? could he have been dumping? could we have been dumping? could you have been dumping? could they have been dumping?
Interro-negative form
Simple form
could I not dump? could you not dump? could he not dump? could we not dump? could you not dump? could they not dump?
V-ing form
could I not be dumping? could you not be dumping? could he not be dumping? could we not be dumping? could you not be dumping? could they not be dumping?
Perfect
could I not have dumped? could you not have dumped? could he not have dumped? could we not have dumped? could you not have dumped? could they not have dumped?
V-ing perfect
could I not have been dumping? could you not have been dumping? could he not have been dumping? could we not have been dumping? could you not have been dumping? could they not have been dumping?