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