could dump
Regular verb: dump - dumped- dumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dump
you could dump
she could dump
we could dump
you could dump
they could dump 	I could be dumping
you could be dumping
she could be dumping
we could be dumping
you could be dumping
they could be dumping	I could have dumped
you could have dumped
she could have dumped
we could have dumped
you could have dumped
they could have dumped	I could have been dumping
you could have been dumping
she could have been dumping
we could have been dumping
you could have been dumping
they could have been dumping	

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

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