Folosesti "didn't" atunci cand verbul este la simple past tense, forma negativa.De exemplu "I didn't eat"(si nu, nu spui cu ate pentru ca didn't arata deja timpul).
"Haven't" se foloseste la present perfect, la forma negativa.
1)- You didn't miss anything. Simple past, not present
2)- You haven't missed anything Present perfect, which is closer to the present
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