As a nerd, I was always used to stay engaged with my academic books.
Or
As a nerd, I have always been engaged with my academic books.
Or
As a nerd, I used to stay engaged with my academic books.
The first sentence does not look grammatically correct to me. Am I right? Which of these sentences is fully correct?
The last one. I have always heard 'textbooks' rather 'academic books'.
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