Hey there! Great question. The past tense of "know" is "knew." When we talk about something that happened in the past and we want to refer to knowing something at that time, we use "knew." For example, "Yesterday, I knew the answer to the question." Think of it like a door. When you know something, it’s like the door to that information is open in your mind. But when you knew something in the past, that door is closed - you can't access that information anymore because it's in the past. So, "knew" is like the closed door to something you knew before.
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