What a shameful conduct!

多么可耻的行为！

He is ashamed of his shameful conduct.

他因其可耻的行为感到惭愧。

Is she sorry for her shameful conduct?

她是不是为了她那可羞的行为而难过呢？

Such shameful conduct should be stopped.

这种可耻的行为是不容许的。