[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"pubgrp:jg-adverb:ja:en":3},{"type":4,"slug":5,"title":6,"level":7,"goal":8,"image_path":9,"is_locked":10,"is_daily_free":10,"formula":11,"gloss":14,"desc":15,"desc_audio":9,"voices":16,"examples":17,"fills":48,"choices":49},"grammar","jg-adverb","Adverbial Form (ku\u002Fni)","intermediate","形容詞から副詞への変換：くとに",null,false,[12,13],"i-adjectives + く \u002F na-adjectives + に","Adjectives (modifying the object being modified) → Adverbs (modifying the manner of actions\u002Fstates)","Converting Adjectives to Adverbs: And such","In English, we describe *how* an action happens using adverbs (quickly, slowly, happily), but Japanese takes a fundamentally different approach. Rather than treating adjectives and adverbs as separate word classes, Japanese **transforms adjectives into adverbial forms** using `く` (for い-adjectives) and `に` (for な-adjectives). This reflects a key difference in how Japanese conceptualizes the relationship between qualities and actions.\n\n**Why this difference matters:** English speakers think of \"quick\" and \"quickly\" as different words from different families—the adjective describes a noun, the adverb describes an action. Japanese thinks of them as **the same quality expressed in different contexts**. When you use an い-adjective like `早い` (hayai—early\u002Ffast), the `い` ending binds it to nouns. Remove that `い`, add `く`, and you've **morphed the word's function** to describe *how* something happens, not *what* something is. This is why `早い車` (fast car) and `早く走る` (run fast) use the same root quality—because they genuinely describe the *same concept* from different angles.\n\nFor な-adjectives like `静かな` (shizuka na—quiet), the `な` is a **particle linking the quality to a noun**. To turn it into an adverb, you simply swap `な` for `に`—the particle that signals **manner or means**. The logic is consistent: `に` is used for \"by this means\" or \"in this manner,\" so `静かに` literally means \"by means of quietness\" or \"in a quiet manner.\"\n\n**The deeper insight:** Japanese doesn't create new words for adverbs; it **repackages existing qualities** to fit new grammatical roles. This reflects the Japanese language's elegance in using word-ending morphology (how words change their form) rather than creating entirely different lexical items. For English speakers used to separate word classes, this feels abstract—but once you internalize it, you unlock a powerful way to build precision into descriptions of actions.",[],[18,23,28,33,38,43],{"en":19,"ko":20,"ko_audio":9,"audio":21,"audios":22},"彼はいつも明るく笑っている。","He always smiles brightly.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002F03b13a30-9ccb-46b4-aad7-92c0da769583.mp3",{},{"en":24,"ko":25,"ko_audio":9,"audio":26,"audios":27},"静かに勉強してください。","Please study quietly.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002F1f109e36-1940-4f7e-ba94-9ceb0aa6ac37.mp3",{},{"en":29,"ko":30,"ko_audio":9,"audio":31,"audios":32},"速く走ると、疲れてしまいます。","If you run quickly, you will get tired.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002Fd12d73be-3486-4446-a160-19fa22718e2c.mp3",{},{"en":34,"ko":35,"ko_audio":9,"audio":36,"audios":37},"丁寧に説明してくれました。","He explained politely.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002F91d3ff58-02a9-445c-8350-a03053c6b4a8.mp3",{},{"en":39,"ko":40,"ko_audio":9,"audio":41,"audios":42},"美しく咲いた桜を見に行きました。","We went to see the beautifully blooming cherry blossoms.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002F0f610811-f3d8-4bdf-bec2-95040b524ddc.mp3",{},{"en":44,"ko":45,"ko_audio":9,"audio":46,"audios":47},"真摯に向き合うことが大切です。","It is important to face things seriously.","https:\u002F\u002Fpub-96bedcbbfd0f4e5d82c4505745cced9c.r2.dev\u002Fblock_audio\u002Ffc694240-aaf7-4672-80d8-46e48ea1dfb9.mp3",{},[],[50,62,73],{"ko":51,"options":52},"「i形容詞 + く」と「na形容詞 + に」が存在する理由として、最も適切なのはどれですか？",[53,56,58,60],{"t":54,"ok":55},"日本語は形容詞の品詞的役割に応じて形態が変わる体系だから",true,{"t":57,"ok":10},"中国語の影響を受けたから",{"t":59,"ok":10},"それらは全く異なる意味を持つから",{"t":61,"ok":10},"動詞と形容詞を区別するためだけだから",{"ko":63,"options":64},"「静か」を動詞を修飾する副詞に変えるには？",[65,67,69,71],{"t":66,"ok":10},"静かく",{"t":68,"ok":55},"静かに",{"t":70,"ok":10},"静かる",{"t":72,"ok":10},"静かて",{"ko":74,"options":75},"「楽しく踊る」と「楽しい本」の違いを説明したものはどれですか？",[76,78,80,82],{"t":77,"ok":10},"前者は形容詞を名詞修飾する形、後者は副詞形である",{"t":79,"ok":55},"前者は副詞形（動作の様子を修飾）、後者は形容詞の基本形（名詞を修飾）である",{"t":81,"ok":10},"二つは全く同じ役割をしている",{"t":83,"ok":10},"前者は過去形で、後者は現在形である"]