I can frighten you can frighten he can frighten we can frighten you can frighten they can frighten
V-ing form
I can be frightening you can be frightening he can be frightening we can be frightening you can be frightening they can be frightening
Perfect
I can have frightened you can have frightened he can have frightened we can have frightened you can have frightened they can have frightened
V-ing perfect
I can have been frightening you can have been frightening he can have been frightening we can have been frightening you can have been frightening they can have been frightening
Negation
Simple form
I can't frighten you can't frighten he can't frighten we can't frighten you can't frighten they can't frighten
V-ing form
I can't be frightening you can't be frightening he can't be frightening we can't be frightening you can't be frightening they can't be frightening
Perfect
I can't have frightened you can't have frightened he can't have frightened we can't have frightened you can't have frightened they can't have frightened
V-ing perfect
I can't have been frightening you can't have been frightening he can't have been frightening we can't have been frightening you can't have been frightening they can't have been frightening
Interrogative form
Simple form
can I frighten? can you frighten? can he frighten? can we frighten? can you frighten? can they frighten?
V-ing form
can I be frightening? can you be frightening? can he be frightening? can we be frightening? can you be frightening? can they be frightening?
Perfect
can I have frightened? can you have frightened? can he have frightened? can we have frightened? can you have frightened? can they have frightened?
V-ing perfect
can I have been frightening? can you have been frightening? can he have been frightening? can we have been frightening? can you have been frightening? can they have been frightening?
Interro-negative form
Simple form
can't I frighten? can't you frighten? can't he frighten? can't we frighten? can't you frighten? can't they frighten?
V-ing form
can't I be frightening? can't you be frightening? can't he be frightening? can't we be frightening? can't you be frightening? can't they be frightening?
Perfect
can't I have frightened? can't you have frightened? can't he have frightened? can't we have frightened? can't you have frightened? can't they have frightened?
V-ing perfect
can't I have been frightening? can't you have been frightening? can't he have been frightening? can't we have been frightening? can't you have been frightening? can't they have been frightening?