3 sentences

1. 这不是什么见不得人的事。

   zhè bù shì shén​me jiàn​bu​dé​rén de shì.

   This is nothing to be ashamed of.

   Source: Dong Chinese Dictionary

2. 这种见不得人的勾当，你千万别参与。

   zhè zhǒng jiàn​bu​dé​rén de gòu​dàng, nǐ qiān​wàn bié cān​yù.

   You must not get involved in such shady business.

   Source: Dong Chinese Dictionary

3. 他们两个私下里经常做一些见不得人的勾当。

   tā​men liǎng gè sī​xià​lǐ jīng​cháng zuò yī​xiē jiàn​bu​dé​rén de gòu dàng.

   The two of them often engage in shady dealings in private.

   Source: Dong Chinese Dictionary