How to know which one is correct?

  1. Friendship that is built on trust has bright future.(passive)

  2. Friendship built on trust has bright future.(past)

Why we can't use build? I asked this question but still have doubts. I mean why passive and past tense make sense when we use build it didn't make sense according to the answers that I got.

  • The words that is (or which is) are completely optional in such contexts (we could say A problem that is shared is a problem halved, but we don't normally bother with that highlighted part). It's not really relevant to talk about "passive" or "past" here - it's just an example of a (past) participle used adjectivally. But note that regardless of whether you include which / that is or not, you still need an indefinite article with a bright future. – FumbleFingers Jul 25 at 14:54
  • Participle used as an adjective. Could you please tell me more on that. – Rocky Jul 25 at 15:29
  • See Be + past participle and Is “named” an adjective in this sentence? (and probably others). – FumbleFingers Jul 25 at 15:39
  • If I use 'build' would it be a wrong one? – Rocky Jul 25 at 17:04
  • That would be completely wrong, yes. Consider Friendship built on trust is important, where it should be easy to see that we'd still have a syntactically valid sentence if we removed the highlighted "adjectival" part (Friendship is important). Or we could add a simple one-word adjective: Close friendship is important (single-word adjectives usually go before the noun). But it wouldn't make any sense at all to say Friendship build on trust is important. – FumbleFingers Jul 25 at 17:49

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