I can appall you can appall he can appall we can appall you can appall they can appall
V-ing form
I can be appalling you can be appalling he can be appalling we can be appalling you can be appalling they can be appalling
Perfect
I can have appalled you can have appalled he 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 he can have been appalling we can have been appalling you can have been appalling they can have been appalling
Negation
Simple form
I cannot appall you cannot appall he cannot appall we cannot appall you cannot appall they cannot appall
V-ing form
I cannot be appalling you cannot be appalling he cannot be appalling we cannot be appalling you cannot be appalling they cannot be appalling
Perfect
I cannot have appalled you cannot have appalled he cannot have appalled we cannot have appalled you cannot have appalled they cannot have appalled
V-ing perfect
I cannot have been appalling you cannot have been appalling he cannot have been appalling we cannot have been appalling you cannot have been appalling they cannot have been appalling
Interrogative form
Simple form
can I appall? can you appall? can he appall? can we appall? can you appall? can they appall?
V-ing form
can I be appalling? can you be appalling? can he be appalling? can we be appalling? can you be appalling? can they be appalling?
Perfect
can I have appalled? can you have appalled? can he 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 he have been appalling? can we have been appalling? can you have been appalling? can they have been appalling?
Interro-negative form
Simple form
can I not appall? can you not appall? can he not appall? can we not appall? can you not appall? can they not appall?
V-ing form
can I not be appalling? can you not be appalling? can he not be appalling? can we not be appalling? can you not be appalling? can they not be appalling?
Perfect
can I not have appalled? can you not have appalled? can he not have appalled? can we not have appalled? can you not have appalled? can they not have appalled?
V-ing perfect
can I not have been appalling? can you not have been appalling? can he not have been appalling? can we not have been appalling? can you not have been appalling? can they not have been appalling?