助動詞を残して後ろを落とす(Yes, I do. / I'd love to.)Yes, I Do: Ellipsis After Auxiliaries
代名詞 / Pronouns
"Do you like it?" には "Yes, I do." で足ります。do が like it を代表しているからです。英語は同じ動詞句を繰り返さず、助動詞だけ残して後ろを落とします。to まで残して落とす形もあります: "Can you come?" "I'd love to."。落とさずに全部言うほうが、かえって不自然に響く——ここがこの仕組みの肝です。
"Do you like it?" needs only "Yes, I do," because the do stands for like it. English refuses to repeat a verb phrase; it keeps the auxiliary and drops the rest. The to can survive the cut as well: "Can you come?" "I'd love to." The heart of the system: saying everything out loud is what sounds unnatural.
形を残して、中身を落とす
Keep the Marker, Drop the Content
落とすときの規則は、疑問文づくりと同じです。be動詞と助動詞は自分が残る: "Are you tired?" "Yes, I am."。一般動詞には代打の do が立つ: "Does she drive?" "Yes, she does."。文の途中でも同じで、She can drive, but he can't. / He said he would call, but he didn't. と、助動詞が動詞句まるごとの代わりを務めます。落とした中身は聞き手にも見えているので、情報は何も失われません。むしろ繰り返すほうが、強調か苛立ちに聞こえます。
The dropping rules mirror question-building. Be and the auxiliaries stand for themselves: "Are you tired?" "Yes, I am." Ordinary verbs send in the substitute do: "Does she drive?" "Yes, she does." Mid-sentence works the same way — She can drive, but he can't. He said he would call, but he didn't. The auxiliary holds the place of the whole verb phrase, the listener sees the dropped content perfectly, and nothing is lost. Repeating it all is what carries a charge: emphasis, or irritation.
残る形いろいろWhat survives the cut
"Haveこの文の組み立て【現在完了】過去に起きたことを、いまと結びつけて言う形。「いつ起きたか」ではなく「いまどうなっているか」に重心がある。だから yesterday のような過去の一点を指す語とは一緒に使えない。 you seen it?" "No, I haven't."
「見た?」「まだ見てない」
have は自力で残る。Have stands for itself.
She said she'd help, and she did.
手伝うと言って、ちゃんと手伝ってくれた。
文の途中でも同じ仕組み。The same machinery, mid-sentence.
"Want to join us?" "I'd love to."
「一緒にどう?」「ぜひ」
to だけ残して、不定詞の中身を落とす。The to survives; the infinitive's content goes.
助動詞で止める(標準)
Yes, I do. / No, she can't. 相手には全部見えている。Yes, I do. No, she can't. The listener fills in the rest.
"Did you lock the door?" "I think I did."
「鍵かけた?」「かけたと思う」
全部言い直す(特別な含み)
省略しないこと自体が合図になる。強調か、反論か。Refusing the cut is itself a signal: emphasis, or pushback.
"You never listen." "I do listen."
「全然聞いてないよね」「聞いてるよ」
よくある間違い / Common Mistake
×"Do you want to come with us?" "Yes, I want."
「一緒に来る?」「うん、行きたい」(のつもりで)
○"Do you want to come with us?" "I'd love to."
「一緒に来る?」「ぜひ」
want は一般動詞なので、want だけで止まると文が宙に浮きます。止まってよい駅は2つ。助動詞の駅(Yes, I do.)か、to の駅(Yes, I want to. / I'd love to.)です。to の後ろの中身は落とせますが、to 自体は残す——この「to 止め」は誘いへの返事の必須装備で、断るときも I'd like to, but I can't.(行きたいのは山々だけど)と角が取れます。日本語の感覚では言い残したようで不安になりますが、これで完結した自然な英語です。
Want is an ordinary verb, so stopping at want leaves the sentence hanging. There are two legal stops: the auxiliary station (Yes, I do) and the to station (Yes, I want to; I'd love to). The content after to drops, but the to itself stays. This to-stop is essential equipment for answering invitations, and it softens refusals too: I'd like to, but I can't. To a Japanese ear it feels unfinished; to an English ear it's complete and natural.
Yes, I do. / No, I don't.うん、そう。/ううん、違う。短い答えの基本形。時制ごと do が引き受ける。The basic short answer, do carrying the tense and all.
I'd love to.ぜひ。/喜んで。誘いへの承諾の定番。to 止めの代表。The standard glad yes, and the flagship to-stop.
I'd like to, but ...そうしたいんだけど……断りの緩衝材。to 止め+理由で角が立たない。The soft refusal: to-stop plus a reason.
You don't have to.無理しなくていいよ。have to の to で止める形。気遣いの定番。Stopping at have to's to — the standard kindness.
まとめ / Summary
同じ動詞句は繰り返さない。助動詞だけ残して落とす。Don't repeat the verb phrase; keep the auxiliary and drop it.
一般動詞の代打は do。疑問文づくりと同じ規則。Ordinary verbs send in do, by the same rules as questions.
to で止まる形(I'd love to.)は誘いの返事の必須装備。The to-stop (I'd love to) is essential for invitations.
省略が中立、全部言うと強調。学校の「完全な文で」とは逆。Clipped is neutral; full is emphatic — school had it backwards.