Reddit reviews Using German: A Guide to Contemporary Usage
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Used Book in Good Condition
Two different tenses. Ich wusste = imperfect, ich habe gewusst = perfect. The perfect is used more day to day (effectively, I have known, but also I knew...), the imperfect in more formal writing as well as the "was ...ing" continuous past sense.
If you're stuck on this, do some more reading on the different uses of the imperfect and perfect tenses. My favourite, the one I refer to all the time and the one I refer my students to, is Durrell's pretty much definitive Using German, which I've used for 20 years but looks quite pricey now sadly.
Try this https://www.amazon.com/Using-German-Guide-Contemporary-Usage/dp/0521530008 (check for a newer edition)