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  • There are many cases where past perfect and simple past are interchangeable (I'm sure I've told you this before), and this is one of them. Commented Nov 3 at 15:49
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    It's clumsy extempore speech, so don't treat it as a model. It's "valid", but only just. If Viola had more time to think before speaking, I'm sure she'd have preferred There was a situation where I didn't know my lines. Commented Nov 3 at 16:31
  • I haven't known until now that he went. Have you ever known what you brother did? Commented Nov 4 at 18:44
  • This question is similar to: What's the difference between the simple past tense and the present perfect?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. Commented Nov 14 at 17:21