On the other end of the spectrum, I had a friend ask me extensively about usage of ‘shall’ and ‘lest’ since his grammar book taught those words, including that ‘should’ is the past tense of ‘shall’ 
Not sure why he keeps using this book, as I’ve told him multiple separate times that a lot of what it’s teaching is never used in the modern day.
I suppose my point is that it may be tricky to try and hit the happy medium of ‘not too colloquial’ and ‘not too shakespearean’ especially when a lot of the materials/teachers are from Taiwan.
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