I often see in movies that the people engaged in a dialogue use the past simple tense in a conditional situation where the correct tense seems to be the past perfect. Is this because the past prefect tense is too out there in an ordinary everyday conversation?
A: "Why didn't you tell me about the party Simon?"
B: "Because I didn't know there was a party. If I knew there was one, I would tell you."
In the above example (and a lot of other similar situations), I assume the correct sentence would be "If I had known, I would've told you." But hardly ever have I seen such a phrasing being used to talk about the past, especially in informal conversations.