I can befoul you can befoul he can befoul we can befoul you can befoul they can befoul
V-ing form
I can be befouling you can be befouling he can be befouling we can be befouling you can be befouling they can be befouling
Perfect
I can have befouled you can have befouled he can have befouled we can have befouled you can have befouled they can have befouled
V-ing perfect
I can have been befouling you can have been befouling he can have been befouling we can have been befouling you can have been befouling they can have been befouling
Negation
Simple form
I cannot befoul you cannot befoul he cannot befoul we cannot befoul you cannot befoul they cannot befoul
V-ing form
I cannot be befouling you cannot be befouling he cannot be befouling we cannot be befouling you cannot be befouling they cannot be befouling
Perfect
I cannot have befouled you cannot have befouled he cannot have befouled we cannot have befouled you cannot have befouled they cannot have befouled
V-ing perfect
I cannot have been befouling you cannot have been befouling he cannot have been befouling we cannot have been befouling you cannot have been befouling they cannot have been befouling
Interrogative form
Simple form
can I befoul? can you befoul? can he befoul? can we befoul? can you befoul? can they befoul?
V-ing form
can I be befouling? can you be befouling? can he be befouling? can we be befouling? can you be befouling? can they be befouling?
Perfect
can I have befouled? can you have befouled? can he have befouled? can we have befouled? can you have befouled? can they have befouled?
V-ing perfect
can I have been befouling? can you have been befouling? can he have been befouling? can we have been befouling? can you have been befouling? can they have been befouling?
Interro-negative form
Simple form
can I not befoul? can you not befoul? can he not befoul? can we not befoul? can you not befoul? can they not befoul?
V-ing form
can I not be befouling? can you not be befouling? can he not be befouling? can we not be befouling? can you not be befouling? can they not be befouling?
Perfect
can I not have befouled? can you not have befouled? can he not have befouled? can we not have befouled? can you not have befouled? can they not have befouled?
V-ing perfect
can I not have been befouling? can you not have been befouling? can he not have been befouling? can we not have been befouling? can you not have been befouling? can they not have been befouling?