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