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 can't befall you can't befall he can't befall we can't befall you can't befall they can't befall
V-ing form
I can't be befalling you can't be befalling he can't be befalling we can't be befalling you can't be befalling they can't be befalling
Perfect
I can't have befallen you can't have befallen he can't have befallen we can't have befallen you can't have befallen they can't have befallen
V-ing perfect
I can't have been befalling you can't have been befalling he can't have been befalling we can't have been befalling you can't have been befalling they can't 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't I befall? can't you befall? can't he befall? can't we befall? can't you befall? can't they befall?
V-ing form
can't I be befalling? can't you be befalling? can't he be befalling? can't we be befalling? can't you be befalling? can't they be befalling?
Perfect
can't I have befallen? can't you have befallen? can't he have befallen? can't we have befallen? can't you have befallen? can't they have befallen?
V-ing perfect
can't I have been befalling? can't you have been befalling? can't he have been befalling? can't we have been befalling? can't you have been befalling? can't they have been befalling?