tenses - "If I didn't have" vs. "if I hadn't had"


Can someone please tell me if these sentences are correct? I prefer number one. Here I am trying to talk about a past condition that didn't actually happen because the person had the example sentences and they did understand.




  1. If I didn't have the example sentences, I wouldn't have understood the text.

  2. If I hadn't had the example sentences, I wouldn't have understood the text.





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