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Anyway, I'm only 7% in (which doesn't seem like much but this is 3 novels plus a book of short stories) but I noticed one of those little grammar quirks that sometimes occur to me. Maybe a sentence like this looks right to you:
After fifteen years, it's become tiresome.
But I realized the contraction could be confusing. It should say:
After fifteen years, it HAS become tiresome.
But you could misinterpret it as:
After fifteen years, it IS become tiresome.
So it's the kind of thing I decide to go in and try to correct whenever possible. I'm sure I do it all the time in books, at least present tense ones. I actually noticed this problem in some of my erotica books, which is probably why I was looking for it now.
Anyway, there's a pro tip on grammar for you. Free of charge!