反応した
解説 Definition
reacted は react（反応する）の過去形・過去分詞です。出来事、言葉、変化などに対して、感情や行動で反応したことを表します。
Reacted is the past tense and past participle of react. It indicates that a person, animal, substance, or system responded to an event, statement, stimulus, or change in a particular emotional, physical, or behavioral way.
覚え方のコツ Memory Tip
reacted は react に -ed を付けた過去形・過去分詞です。原形が /t/ で終わるため -ed は /ɪd/ と発音し、全体は /riˈæktɪd/ になります。reacted calmly to the news、reacted quickly、reacted to a noise のように、刺激へ感情や行動を「返した」場面と結び付けて覚えましょう。
Begin with react, “respond to a stimulus or event,” and add the regular past ending -ed. Because react ends in the /t/ sound, the ending is pronounced /ɪd/, giving /riˈæktɪd/. Think of a response traveling back after something happens: she reacted calmly to news, a dog reacted to a noise, or someone reacted quickly to a changed plan. The frequent pattern is react to something, while an adverb such as calmly, badly, or quickly tells how the response occurred.
例文
She reacted calmly to the news.
彼女はその知らせに落ち着いて反応しました。
The dog reacted to the loud noise.
犬は大きな音に反応しました。
He reacted quickly when the plan changed.
計画が変わったとき、彼はすばやく反応しました。
reacted の類義語・関連語
対義語
紛らわしい語
reacted の語源・成り立ち Etymology
reacted は react の過去形。語源はラテン語 reagere「やり返す・反対に動かす」で、re-「後ろへ・再び」+ agere「行う」から成り、刺激に対して行為を返すので「反応した」となる。関連語は action, agent。
Reacted is the regular past tense and past participle of react, formed with -ed. React was created from Latin re-, conveying movement back or again, and agere, “to do” or “to act.” Its underlying image is therefore that of acting back in response to something. The same Latin verb lies behind English words such as action and agent.
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