I can foul you can foul he can foul we can foul you can foul they can foul
V-ing form
I can be fouling you can be fouling he can be fouling we can be fouling you can be fouling they can be fouling
Perfect
I can have fouled you can have fouled he can have fouled we can have fouled you can have fouled they can have fouled
V-ing perfect
I can have been fouling you can have been fouling he can have been fouling we can have been fouling you can have been fouling they can have been fouling
Negation
Simple form
I cannot foul you cannot foul he cannot foul we cannot foul you cannot foul they cannot foul
V-ing form
I cannot be fouling you cannot be fouling he cannot be fouling we cannot be fouling you cannot be fouling they cannot be fouling
Perfect
I cannot have fouled you cannot have fouled he cannot have fouled we cannot have fouled you cannot have fouled they cannot have fouled
V-ing perfect
I cannot have been fouling you cannot have been fouling he cannot have been fouling we cannot have been fouling you cannot have been fouling they cannot have been fouling
Interrogative form
Simple form
can I foul? can you foul? can he foul? can we foul? can you foul? can they foul?
V-ing form
can I be fouling? can you be fouling? can he be fouling? can we be fouling? can you be fouling? can they be fouling?
Perfect
can I have fouled? can you have fouled? can he have fouled? can we have fouled? can you have fouled? can they have fouled?
V-ing perfect
can I have been fouling? can you have been fouling? can he have been fouling? can we have been fouling? can you have been fouling? can they have been fouling?
Interro-negative form
Simple form
can I not foul? can you not foul? can he not foul? can we not foul? can you not foul? can they not foul?
V-ing form
can I not be fouling? can you not be fouling? can he not be fouling? can we not be fouling? can you not be fouling? can they not be fouling?
Perfect
can I not have fouled? can you not have fouled? can he not have fouled? can we not have fouled? can you not have fouled? can they not have fouled?
V-ing perfect
can I not have been fouling? can you not have been fouling? can he not have been fouling? can we not have been fouling? can you not have been fouling? can they not have been fouling?