A conversation between A and B A: It is very good for your body to eat apples every day. Q1: B: I didn’t know that. If B means that I didn’t know that (before), until now you tell me.
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Jacky56Lin1.If the answer of Q4 ”I knew that." is not much politer than Q5” I have known that for a long time.” ?Q4 seems less polite because it is shorter, but of course, impoliteness depends on the tone of voice.
Jacky56Lin2. I didn’t know that until now you tell me. if it seems = "I did not know that. You told me, so now