noun
BAD : There is an opportunity that David's father will come tonight.
GOOD : There is a chance that David's father will come tonight.
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When you talk about the likelihood of something happening, use chance (NOT opportunity ): 'I think she has a good chance of passing.' 'There's very little chance that anyone has survived the crash.'
Compare: 'Tomorrow's test will be an opportunity/a chance for you to find out how much you know.' (= a particular time when something is possible)