http://grafinok.livejournal.com/ ([identity profile] grafinok.livejournal.com) wrote in [community profile] learn_russian 2007-05-11 08:18 pm (UTC)

I think the best would be пока он писал роман or когда он писал роман. Verbal adverb is hardly used in this case.

в оперу means that you`re going to a musical theater.
на оперу emphasizes that you`re going to listen opera.

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