Here is the sentence which I need to ask a question about, but I am not sure which tense to use.<br/><br/>"You knew what was going on, but didn't tell me."<br/><br/>Should my question be:<br/><br/>Why did you not tell me that you <u>had known</u> or should I say <u>knew</u> what was going on?<br/><br/>Thank you