Eng: Not allowed

不行

Can't, No, Nope, Not allowed, Unable to

不可

Difficult, Forbidden, Hard, No, None, Not allowed

不可以

Not allowed

Am able, Are able, Being able to, Can, Can be, Capable, Difficult, Forbidden, Hard, Is able, No, None, Permits, Permitted, Permitting, To be able, Was able, Were able