I can appall you can appall she can appall we can appall you can appall they can appall
V-ing form
I can be appalling you can be appalling she can be appalling we can be appalling you can be appalling they can be appalling
Perfect
I can have appalled you can have appalled she can have appalled we can have appalled you can have appalled they can have appalled
V-ing perfect
I can have been appalling you can have been appalling she can have been appalling we can have been appalling you can have been appalling they can have been appalling
Negation
Simple form
I can't appall you can't appall she can't appall we can't appall you can't appall they can't appall
V-ing form
I can't be appalling you can't be appalling she can't be appalling we can't be appalling you can't be appalling they can't be appalling
Perfect
I can't have appalled you can't have appalled she can't have appalled we can't have appalled you can't have appalled they can't have appalled
V-ing perfect
I can't have been appalling you can't have been appalling she can't have been appalling we can't have been appalling you can't have been appalling they can't have been appalling
Interrogative form
Simple form
can I appall? can you appall? can she appall? can we appall? can you appall? can they appall?
V-ing form
can I be appalling? can you be appalling? can she be appalling? can we be appalling? can you be appalling? can they be appalling?
Perfect
can I have appalled? can you have appalled? can she have appalled? can we have appalled? can you have appalled? can they have appalled?
V-ing perfect
can I have been appalling? can you have been appalling? can she have been appalling? can we have been appalling? can you have been appalling? can they have been appalling?
Interro-negative form
Simple form
can't I appall? can't you appall? can't she appall? can't we appall? can't you appall? can't they appall?
V-ing form
can't I be appalling? can't you be appalling? can't she be appalling? can't we be appalling? can't you be appalling? can't they be appalling?
Perfect
can't I have appalled? can't you have appalled? can't she have appalled? can't we have appalled? can't you have appalled? can't they have appalled?
V-ing perfect
can't I have been appalling? can't you have been appalling? can't she have been appalling? can't we have been appalling? can't you have been appalling? can't they have been appalling?