I'd been walking for about 10 minutes when a car suddenly stopped just behind me .

これは日本語に訳すとどうなりますか？

過去完了進行形のニュアンスが、よく理解できていないのかもしれません。 是什麼意思

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Let’s say that it was Sunday morning, and you were walking outside. You walked during ten minutes. All of a sudden, a car stopped behind you.

I assume that you were walking on the street and there was no traffic, but things changed later because a car came and had to stop to avoid hitting you. You almost got run over by a car, sir. Watch out. :)

“I had been walking” describes a period of time. “The car stopped” is what happened during that time.

I hope this helps. :)