He decided to quit his job. I don't blame him - the working conditions were terrible.

I 是第一人称代词"我"的主格形式。 don't 是 do not 的缩写形式，表示否定。 blame 是动词，意思是"责备、责怪"。 him 是第三人称代词"他"的宾格形式。 I don't blame him 这个短语直译为"我不责怪他"，在口语中常用来表示理解或认同对方的决定或行为。