How does one say 'I knew' in Mandarin? I have considered some ways of saying this, but they either do not convey the intended meaning of having known something, but no longer knowing it, or they are very unwieldy. For example: 我知道了: already knew 昨天我知道，但是我忘了: unwieldy. How about '我不再知道'? Would this work as 'I knew'? How would others translate it? Thanks in advance!

What does '我之前知道' mean? Does it imply that while I knew it before, I no longer do? Or simply that I already knew something? Thanks in advance!

阴郁的颜色之升值 黑色，红色，这些颜色春天从土发芽，日落从天下跌。 顾你的火，红焱和黑木是家的暖和。 顾你的衣服，红绸和黑缕是体的暖和。 顾你的信，红印和黑墨是心的暖和。 黑暗送给我们看不见的事之激动 红喂给我们豆署和茶 因此，听这些颜色的名字，就记得红茶之苦味在平静的黑暗。