" So I think it is more appropriate to use the past tense in the sentence above. Am I wrong? You are not wrong (though you mean 'past participle', not 'past tense').
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sophianzThe expression "what you should have done" means "what you needed to do and what you did not do in the PAST." So I think it is more appropriate to use the past tense in the sentence above. Am I wrong?You are not wrong (though you mean 'past participle', not 'past tense'). However, the form used is very common and widely accepted.
sophianzIs it possible to use "was" instead of "is"?What you should have done was call the police.Is it grammatically correct?It is grammatically correct and the native choice.