I can befall you can befall he can befall we can befall you can befall they can befall
V-ing form
I can be befalling you can be befalling he can be befalling we can be befalling you can be befalling they can be befalling
Perfect
I can have befallen you can have befallen he can have befallen we can have befallen you can have befallen they can have befallen
V-ing perfect
I can have been befalling you can have been befalling he can have been befalling we can have been befalling you can have been befalling they can have been befalling
Negation
Simple form
I cannot befall you cannot befall he cannot befall we cannot befall you cannot befall they cannot befall
V-ing form
I cannot be befalling you cannot be befalling he cannot be befalling we cannot be befalling you cannot be befalling they cannot be befalling
Perfect
I cannot have befallen you cannot have befallen he cannot have befallen we cannot have befallen you cannot have befallen they cannot have befallen
V-ing perfect
I cannot have been befalling you cannot have been befalling he cannot have been befalling we cannot have been befalling you cannot have been befalling they cannot have been befalling
Interrogative form
Simple form
can I befall? can you befall? can he befall? can we befall? can you befall? can they befall?
V-ing form
can I be befalling? can you be befalling? can he be befalling? can we be befalling? can you be befalling? can they be befalling?
Perfect
can I have befallen? can you have befallen? can he have befallen? can we have befallen? can you have befallen? can they have befallen?
V-ing perfect
can I have been befalling? can you have been befalling? can he have been befalling? can we have been befalling? can you have been befalling? can they have been befalling?
Interro-negative form
Simple form
can I not befall? can you not befall? can he not befall? can we not befall? can you not befall? can they not befall?
V-ing form
can I not be befalling? can you not be befalling? can he not be befalling? can we not be befalling? can you not be befalling? can they not be befalling?
Perfect
can I not have befallen? can you not have befallen? can he not have befallen? can we not have befallen? can you not have befallen? can they not have befallen?
V-ing perfect
can I not have been befalling? can you not have been befalling? can he not have been befalling? can we not have been befalling? can you not have been befalling? can they not have been befalling?