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