I can badmouth you can badmouth he can badmouth we can badmouth you can badmouth they can badmouth
V-ing form
I can be badmouthing you can be badmouthing he can be badmouthing we can be badmouthing you can be badmouthing they can be badmouthing
Perfect
I can have badmouthed you can have badmouthed he can have badmouthed we can have badmouthed you can have badmouthed they can have badmouthed
V-ing perfect
I can have been badmouthing you can have been badmouthing he can have been badmouthing we can have been badmouthing you can have been badmouthing they can have been badmouthing
Negation
Simple form
I cannot badmouth you cannot badmouth he cannot badmouth we cannot badmouth you cannot badmouth they cannot badmouth
V-ing form
I cannot be badmouthing you cannot be badmouthing he cannot be badmouthing we cannot be badmouthing you cannot be badmouthing they cannot be badmouthing
Perfect
I cannot have badmouthed you cannot have badmouthed he cannot have badmouthed we cannot have badmouthed you cannot have badmouthed they cannot have badmouthed
V-ing perfect
I cannot have been badmouthing you cannot have been badmouthing he cannot have been badmouthing we cannot have been badmouthing you cannot have been badmouthing they cannot have been badmouthing
Interrogative form
Simple form
can I badmouth? can you badmouth? can he badmouth? can we badmouth? can you badmouth? can they badmouth?
V-ing form
can I be badmouthing? can you be badmouthing? can he be badmouthing? can we be badmouthing? can you be badmouthing? can they be badmouthing?
Perfect
can I have badmouthed? can you have badmouthed? can he have badmouthed? can we have badmouthed? can you have badmouthed? can they have badmouthed?
V-ing perfect
can I have been badmouthing? can you have been badmouthing? can he have been badmouthing? can we have been badmouthing? can you have been badmouthing? can they have been badmouthing?
Interro-negative form
Simple form
can I not badmouth? can you not badmouth? can he not badmouth? can we not badmouth? can you not badmouth? can they not badmouth?
V-ing form
can I not be badmouthing? can you not be badmouthing? can he not be badmouthing? can we not be badmouthing? can you not be badmouthing? can they not be badmouthing?
Perfect
can I not have badmouthed? can you not have badmouthed? can he not have badmouthed? can we not have badmouthed? can you not have badmouthed? can they not have badmouthed?
V-ing perfect
can I not have been badmouthing? can you not have been badmouthing? can he not have been badmouthing? can we not have been badmouthing? can you not have been badmouthing? can they not have been badmouthing?