Used Books Amazon

Amazon is in the process of developing a secret project that will allow users to sell their e-books. When digital books are resold a portion of the revenue will be paid to the rights holder. This ...

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MSN: Side gig idea - how & where to resell used books

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When is "some" used as plural and when is it used as singular?

I am trying to find out if this question is correct. Did Wang Bo used to be awkward? Should I write "use to be" instead of "used to be," or is "used to be" correct in this sentence?

What is the negative form of "I used to be"? I often hear "I didn't used to be" but that sounds awfully wrong in my ears.

What's the negation of "I used to be"? Surely not "I didn't used to be"?

What is the difference between "I used to" and "I'm used to" and when to use each of them? Here, I have read the following example: I used to do something: "I used to drink green tea."

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If "used to" is a set idiomatic phrase (i.e. not a tense), then why would it change its form from "use to" to "used to" for the sentence as it does in the positive?

These make up the vast majority of hits for 'can help doing something' in the Corpus of Contemporary American English. In the sentence given though, help is quite definitely a verb, and used in an affirmative context, so it would be best to have either a plain infinitival or to -infinitival following it.

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