I could dump you could dump she could dump we could dump you could dump they could dump
V-ing form
I could be dumping you could be dumping she could be dumping we could be dumping you could be dumping they could be dumping
Perfect
I could have dumped you could have dumped she 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 she could have been dumping we could have been dumping you could have been dumping they could have been dumping
Negation
Simple form
I couldn't dump you couldn't dump she couldn't dump we couldn't dump you couldn't dump they couldn't dump
V-ing form
I couldn't be dumping you couldn't be dumping she couldn't be dumping we couldn't be dumping you couldn't be dumping they couldn't be dumping
Perfect
I couldn't have dumped you couldn't have dumped she couldn't have dumped we couldn't have dumped you couldn't have dumped they couldn't have dumped
V-ing perfect
I couldn't have been dumping you couldn't have been dumping she couldn't have been dumping we couldn't have been dumping you couldn't have been dumping they couldn't have been dumping
Interrogative form
Simple form
could I dump? could you dump? could she dump? could we dump? could you dump? could they dump?
V-ing form
could I be dumping? could you be dumping? could she be dumping? could we be dumping? could you be dumping? could they be dumping?
Perfect
could I have dumped? could you have dumped? could she 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 she have been dumping? could we have been dumping? could you have been dumping? could they have been dumping?
Interro-negative form
Simple form
couldn't I dump? couldn't you dump? couldn't she dump? couldn't we dump? couldn't you dump? couldn't they dump?
V-ing form
couldn't I be dumping? couldn't you be dumping? couldn't she be dumping? couldn't we be dumping? couldn't you be dumping? couldn't they be dumping?
Perfect
couldn't I have dumped? couldn't you have dumped? couldn't she have dumped? couldn't we have dumped? couldn't you have dumped? couldn't they have dumped?
V-ing perfect
couldn't I have been dumping? couldn't you have been dumping? couldn't she have been dumping? couldn't we have been dumping? couldn't you have been dumping? couldn't they have been dumping?