as という語は,発音も綴字も単純です.短く,高頻度でもあります.しかし,気が遠くなるほど多くの用法があり,品詞としてでみても前置詞,接続詞,副詞,関係代名詞と多彩です.以下に様々な用法の例文をあげておきましょう.
・ They were all dressed as clowns.
・ I respect him as a doctor.
・ You're as tall as your father.
・ As she grew older, she gained in confidence.
・ Leave the papers as they are.
・ As you were out, I left a message.
・ Happy as they were, there was something missing.
・ I have never heard such stories as he tells.
この多義性はいったい何なのでしょうか.では,語源から as の多義性の謎に迫ってみましょう.そうなのか!
そう,そうなのです.so だったのです.「同じ」を原義に含む so が all で強められたのが also で,also が弱まったのが as というわけでした.原義が広く一般的なので,そこから多方面に派生して,用法も多彩になってきたということです.詳しくは「#693. as, so, also」 ([2011-03-21-1]) をご覧ください.
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