I have come across this situation many times. For example:

Interactive e-books can not only show characters' movements and facial expressions but also can let the children (readers) choose what would they do under the scenarios.

Should I use plural for those words? I feel it may not be necessary but characters have many movements and facial expressions in an e-book and there are many scenarios in an e-book too.

I tried searching Google for it but I cannot find explanations for this kind of situation.

  • 2
    In your example, it's relatively straightforward: there are plural characters, and each will have its own expression and movement; also, there is clearly more than one scenario, since there are plural ebooks. Plurals are correct in your sentence, as you have them. (For the plural of scenario, see here.) Commented Sep 29, 2016 at 1:37

1 Answer 1


"movements" is correct, since each character would have more than one movement.

"facial expressions" is also correct, for the same reason.

"under the scenarios" is wrong. "the" implies singular; only one. I would re-write this as "under each scenario", since such adventures follow only one scenario at a time.

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