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