The question is Is it right to say "Is John lie?"
The question is perfectly clear and has a perfectly clear answer. I don't see any specific section of the FAQ that would indicate that the question is not a good fit for the site.
I would have closed it as general reference as it is too basic, and can be answered by looking in a dictionary.
If the OP had ask if there are some dialects where "Is John lie?" is perfectly acceptable, that would have been different; as it is, the question is too basic, and you can get an answer by looking at the dictionary, and checking if lie is used as adjective.
It would have been also better if the OP had described exactly what question he had about that sentence (e.g. the usage of an infinitive after "I am," the usage of a noun after "I am").