1) Ten years have passed since he died (OK)
2) Ten years had passed since he died (??)
I'm not sure if 2) is grammatically correct
= past participle + since + subject + verb(past tense)
"Ten years had passed since he had died" sounds better to me, though in reality I expect you will find both forms used.
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"Ten years had passed since he had died" sounds better to me, though in reality I expect you will find both forms used.
Both are correct, but with different meanings.
1) Ten years have passed since he died (OK) Sounds like he died in 2009 and now it is 2019.
2) Ten years had passed since he died (OK) Sounds l