tā / zuò / le / kuī xīn shì / měi dāng / yè shēn rén jìng / shí / zǒng / jué de / wèn xīn yǒu kuì

他做了亏心事，每当夜深人静时总觉得问心有愧。

He did something shady, and whenever it was quiet at night, he felt guilty.