All was happened due to his carelessness.
All happened due to his carelessness.
Which one is correct and why? Is first one in Passive voice? Please define it.
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The phrase "All was happened..." is incorrect. But if you're using passive voice, you could say
All was happening due to his carelessness.
Or this might sound a little more natural:
Everything was happening due to his carelessness.
The second sentence in your question is correct as-is.
You can say "All heppened" or "Everything happened". Or you can say "All was happening" or "Everything was happening". But saying "All was happened" is not correct grammar. "Was" describes a state of being -- all was quiet, all was well, all was chaotic, all was happening. But "happened" is a one-time past event, not a state of being, and cannot follow "was".