I could oppress you could oppress he could oppress we could oppress you could oppress they could oppress
V-ing form
I could be oppressing you could be oppressing he could be oppressing we could be oppressing you could be oppressing they could be oppressing
Perfect
I could have oppressed you could have oppressed he could have oppressed we could have oppressed you could have oppressed they could have oppressed
V-ing perfect
I could have been oppressing you could have been oppressing he could have been oppressing we could have been oppressing you could have been oppressing they could have been oppressing
Negation
Simple form
I couldn't oppress you couldn't oppress he couldn't oppress we couldn't oppress you couldn't oppress they couldn't oppress
V-ing form
I couldn't be oppressing you couldn't be oppressing he couldn't be oppressing we couldn't be oppressing you couldn't be oppressing they couldn't be oppressing
Perfect
I couldn't have oppressed you couldn't have oppressed he couldn't have oppressed we couldn't have oppressed you couldn't have oppressed they couldn't have oppressed
V-ing perfect
I couldn't have been oppressing you couldn't have been oppressing he couldn't have been oppressing we couldn't have been oppressing you couldn't have been oppressing they couldn't have been oppressing
Interrogative form
Simple form
could I oppress? could you oppress? could he oppress? could we oppress? could you oppress? could they oppress?
V-ing form
could I be oppressing? could you be oppressing? could he be oppressing? could we be oppressing? could you be oppressing? could they be oppressing?
Perfect
could I have oppressed? could you have oppressed? could he have oppressed? could we have oppressed? could you have oppressed? could they have oppressed?
V-ing perfect
could I have been oppressing? could you have been oppressing? could he have been oppressing? could we have been oppressing? could you have been oppressing? could they have been oppressing?
Interro-negative form
Simple form
couldn't I oppress? couldn't you oppress? couldn't he oppress? couldn't we oppress? couldn't you oppress? couldn't they oppress?
V-ing form
couldn't I be oppressing? couldn't you be oppressing? couldn't he be oppressing? couldn't we be oppressing? couldn't you be oppressing? couldn't they be oppressing?
Perfect
couldn't I have oppressed? couldn't you have oppressed? couldn't he have oppressed? couldn't we have oppressed? couldn't you have oppressed? couldn't they have oppressed?
V-ing perfect
couldn't I have been oppressing? couldn't you have been oppressing? couldn't he have been oppressing? couldn't we have been oppressing? couldn't you have been oppressing? couldn't they have been oppressing?