『講的一套, 做的又另一套』的英文是怎麼說?

Talk about A but do B

hypocritical (adj), hypocrite (n-person), hypocrisy (n-concept)

John is a hypocrite; he does not practise what he preaches.
John says one thing and acts completely differently; his action is hypocritical.
John's words and actions are totally different, and that is such a hypocrisy.

Two faced

For example: You are such a two faced ass hole

Two Faced man / woman = 講一套做一套的人
Two Faced = 講一套做一套 (形容詞)

talk something and do an other thing

two-faced

say one but do other one

two-faced
(有)兩面的,雙面的