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 cannot soften you cannot soften he cannot soften we cannot soften you cannot soften they cannot soften
V-ing form
I cannot be softening you cannot be softening he cannot be softening we cannot be softening you cannot be softening they cannot be softening
Perfect
I cannot have softened you cannot have softened he cannot have softened we cannot have softened you cannot have softened they cannot have softened
V-ing perfect
I cannot have been softening you cannot have been softening he cannot have been softening we cannot have been softening you cannot have been softening they cannot 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 I not soften? can you not soften? can he not soften? can we not soften? can you not soften? can they not soften?
V-ing form
can I not be softening? can you not be softening? can he not be softening? can we not be softening? can you not be softening? can they not be softening?
Perfect
can I not have softened? can you not have softened? can he not have softened? can we not have softened? can you not have softened? can they not have softened?
V-ing perfect
can I not have been softening? can you not have been softening? can he not have been softening? can we not have been softening? can you not have been softening? can they not have been softening?