【對焦中英翻譯】「言行不一」的英文怎麼說？

阻礙中文翻譯最大的元凶：錯誤的教學/錯誤的學習
網路查言行不一的英文，有曰：say one thing and do another；惟, 此句成語，意指說一套做一套，非言行不一，如：

說一套做一套
Say one thing and do another

例：他們都是說一套做一套的人，我不相信他們。
They all say one thing and do another. I don’t believe them.

「言行不一」的英文，根據網路可查的例句，計有：
1. One’s acts are at variance with one’s words (or one’s actions are at variance with one’s promises)
例：政客言行不一，你怎能相信他們？
Politician’s acts are at variance with their words. How can you trust them? 

2. one's conduct disagrees with one's words.
例：他言行不一。 His conduct disagrees with his words.

 
3. one's conduct is not consistent with what one says
例：你的言行不一。Your conduct is not consistent with what you say.

這些句子都是老外所寫，自非華人英文通瞎掰出來的可比，學子若無法區辨，自不可能寫出道地英文，實則，英文是否學到家，看你翻譯，看你寫英文即知，老是聽人家在那裏講定義，講一些有的沒的，不親自去尋找例句，比較例句，探究例句，想超越英文學習障礙，難！