Hello, rajesh. Begin by capitalizing the first word of your sentence and applying apostrophes to contractions.
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rajesh jain Is this sentence correct?. Now it is.
He would/could have been a good dancer, if he hadn't met with that fatal accident that took his life away.
With "would", it's definite. (at least as much as it is possible to be definite about the future)
With "could", it's possible.