Его юмор иногда помогает нам в сложные моменты.

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Breakdown of Его юмор иногда помогает нам в сложные моменты.

• помогать: to help
• сложный: difficult
• иногда: sometimes

Questions & Answers about Его юмор иногда помогает нам в сложные моменты.

Why is его used here, and not свой? What exactly does его mean in this sentence?

Его is the non-reflexive possessive pronoun his / its. It can refer to:

• a male person: his humor
• sometimes a neuter noun mentioned before: its humor (for example, a show, a film, etc.)

You do not use свой here, because свой normally refers back to the subject of the same clause.

• If the subject is он (he), then:
  
  • Он шутит. Его юмор помогает нам. – He jokes. His humor helps us.
    Here его is correct; it refers to him but is not reflecting back as subject and object of the same verb.

Свой would fit better in structures like:

• Он помогает своим друзьям. – He helps his (own) friends.
  Here, он is the subject and своим refers back to that same person within the same action.

So in the original sentence, его simply means his (or its), not one’s own.

Why is нам used, and what case is it? Why not нас?