~だけではなく (not only X)
grammar6 sentences
The additive-negation frame ~だけで(は)なく '(not) only X (but also)', used to extend a claim beyond the initially stated limit. Usually paired with a following も (or も~も) clause naming the additional element: 漢字だけではなく文法も難しい ('not only kanji but grammar is also hard'). The は is optional; with it, the contrast is slightly more marked. Parallel construction: ~ばかりでなく.
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