I have doubt that whether the following sentence is correct or not:

> 
> Anytime my teacher was teaching the lesson, I was misunderstanding some notable points.
> 
> 
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Actually, I want to use this sentence in a formal text. Is it the correct way to use "misunderstand" in a Past Continuous Tense form, given that I didn't see something like this. Besides, is "misunderstand" a suitable word for a formal text?