I could befall you could befall he could befall we could befall you could befall they could befall
V-ing form
I could be befalling you could be befalling he could be befalling we could be befalling you could be befalling they could be befalling
Perfect
I could have befallen you could have befallen he could have befallen we could have befallen you could have befallen they could have befallen
V-ing perfect
I could have been befalling you could have been befalling he could have been befalling we could have been befalling you could have been befalling they could have been befalling
Negation
Simple form
I couldn't befall you couldn't befall he couldn't befall we couldn't befall you couldn't befall they couldn't befall
V-ing form
I couldn't be befalling you couldn't be befalling he couldn't be befalling we couldn't be befalling you couldn't be befalling they couldn't be befalling
Perfect
I couldn't have befallen you couldn't have befallen he couldn't have befallen we couldn't have befallen you couldn't have befallen they couldn't have befallen
V-ing perfect
I couldn't have been befalling you couldn't have been befalling he couldn't have been befalling we couldn't have been befalling you couldn't have been befalling they couldn't have been befalling
Interrogative form
Simple form
could I befall? could you befall? could he befall? could we befall? could you befall? could they befall?
V-ing form
could I be befalling? could you be befalling? could he be befalling? could we be befalling? could you be befalling? could they be befalling?
Perfect
could I have befallen? could you have befallen? could he have befallen? could we have befallen? could you have befallen? could they have befallen?
V-ing perfect
could I have been befalling? could you have been befalling? could he have been befalling? could we have been befalling? could you have been befalling? could they have been befalling?
Interro-negative form
Simple form
couldn't I befall? couldn't you befall? couldn't he befall? couldn't we befall? couldn't you befall? couldn't they befall?
V-ing form
couldn't I be befalling? couldn't you be befalling? couldn't he be befalling? couldn't we be befalling? couldn't you be befalling? couldn't they be befalling?
Perfect
couldn't I have befallen? couldn't you have befallen? couldn't he have befallen? couldn't we have befallen? couldn't you have befallen? couldn't they have befallen?
V-ing perfect
couldn't I have been befalling? couldn't you have been befalling? couldn't he have been befalling? couldn't we have been befalling? couldn't you have been befalling? couldn't they have been befalling?