Grammar Rule in 30 Seconds
'Catch up' means closing a gap—whether that's physical distance, missed work, or time spent apart from a friend.
- Use 'catch up with' for people you haven't seen lately: 'Let's catch up with Sarah.'
- Use 'catch up on' for tasks or sleep: 'I need to catch up on work.'
- The past tense is 'caught up'—never 'catched up': 'I caught up with him yesterday.'
Overview
catch up は日常会話で非常に頻繁に使われる重要な表現です。日本語には「追いつく」という直訳的な言葉がありますが、英語の catch up は、単に物理的に距離を縮めるだけでなく、情報や仕事、人間関係のアップデートなど、非常に広い文脈で使われます。日本語の「追いつく」が物理的な移動を連想させやすいのに対し、英語の catch up は「以前の遅れを取り戻し、現在の基準に合わせる」というプロセスそのものに焦点が当てられています。catch up という枠組みで捉えます。この感覚を身につけることが、B1レベルから一段上の英語力を目指すための鍵となります。本稿では、この catch up の構造を、日本語の文法感覚と比較しながら徹底的に解説していきます。catch up の本質は「均衡化（Equalization）」です。何らかの理由で他の人や物事よりも後ろにいる状態（遅れている状態）から、努力やプロセスを経て、現在の地点まで到達することを指します。日本語の文法で言う「状態の遷移」に近い概念です。catch up は、以下の2つの前置詞を使い分けることで、その対象を明確にします。- 1
catch up with: 主に人、グループ、あるいは進行中のトレンドに対して使われます。日本語の「～に追いつく」と感覚が近いです。 - 2
catch up on: 主に終わっていない仕事、勉強、睡眠、あるいは情報（ニュースなど）に対して使われます。これは日本語の「～の遅れを取り戻す」「～を消化する」という表現に相当します。
catch up は「分離可能（Separable）」な動詞でもあります。特に誰かに情報を伝える際、catch [人] up on [内容] という形で、目的語を動詞と副詞の間に挟むことができます。これは日本語の「～に～を教えてあげる（現状を共有する）」という文脈で使われます。日本語では「現状を教える」と表現しますが、英語では「（その人を）現在の地点まで引き上げる」というニュアンスで catch up を使います。この「相手を現在のレベルまで引き上げる」という発想は、日本語の敬語や人間関係の調整にも通じる、非常に英語的かつコミュニケーション能力を左右する重要な視点です。I need to run to catch up.（追いつくために走らなきゃ。）He finally caught up with the others.（彼はついに他の人たちに追いついた。）I have to catch up on my emails.（溜まっているメールを処理しなきゃ。）Could you catch me up on the project?（プロジェクトの現状を教えてくれる？）
catch up は活躍します。特に日本人が使いこなすと非常に自然に聞こえる場面を挙げます。- 1仕事や勉強の遅れを取り戻すとき: コンビニのアルバイトや会社の業務で、忙しくて作業が溜まってしまったとき。「溜まっている仕事を片付ける」という意味で
catch up on my workを使います。日本語で「残業して追いつく」と言うのと同様です。 - 2久しぶりに友人と会うとき: 居酒屋やカフェで友人と会うとき、
Let's catch up!と言うと、「近況報告をし合おう」「積もる話をしよう」という非常にポジティブな響きになります。これは日本語の「久しぶりに話そう」の最も自然な英語表現です。 - 3最新情報を把握するとき: ニュースやSNSをチェックして最新の状態になることを
catch up on the newsと言います。忙しい現代人にとって、この表現は必須です。 - 4睡眠不足を解消するとき: 週末に寝溜めすることを
catch up on sleepと言います。日本語の「寝溜め」は少しカジュアルですが、英語のこの表現は非常に一般的です。
- 1前置詞の混同:
catch up with my homeworkと言ってしまうミス。日本語の「宿題に追いつく」という直訳から来ますが、宿題は「情報やタスク」なのでonが正解です。withは人や移動する対象に使います。 - 2目的語の欠落:
I need to catch up.と言わなければならない場面で、I need to catch up my work.と言ってしまう（withやonが抜ける）。日本語は助詞（を、に）で接続しますが、英語は前置詞が不可欠です。前置詞を忘れると、動詞が何を対象にしているのか不明瞭になります。 - 3「会う」との混同: 初対面の人に対して
It's nice to catch up with you.と言うミス。catch upは「以前の関係性があり、空白期間がある」ことが前提です。日本語の「お会いできて光栄です（初対面）」を直訳すると失礼になる可能性があるため注意が必要です。
catch up と似た意味を持つ表現との違いを確認しましょう。catch up は「マイナスをゼロ（現在）に戻す」プロセスですが、keep up は「ゼロ（現在）を維持する」という違いがあります。例えば、I can't keep up with the class. と言えば、「授業のスピードについていけない」という意味になり、catch up を使うと「遅れた分を取り戻して授業についていきたい」というニュアンスになります。catch up は過去形でも使えますか？caught up となります。I caught up on my reading yesterday.（昨日、読書が追いついた）のように使います。catch up はビジネスシーンで使っても大丈夫ですか？Could you please update me on the project? と言う方が丁寧です。同僚同士なら Can you catch me up on the project? で全く問題ありません。catch up と catch up with で意味が少し変わるのですか？with は「人」や「動いているもの」との並走をイメージさせるからです。一方で on は「上に乗る」というイメージから、溜まったタスクという「山」を崩していく感覚と結びついています。Conjugation of 'Catch Up'
| Tense | Subject | Form |
|---|---|---|
|
Present Simple
|
I/You/We/They
|
catch up
|
|
Present Simple
|
He/She/It
|
catches up
|
|
Past Simple
|
All subjects
|
caught up
|
|
Present Continuous
|
All subjects
|
am/is/are catching up
|
|
Past Continuous
|
All subjects
|
was/were catching up
|
|
Present Perfect
|
All subjects
|
have/has caught up
|
|
Future
|
All subjects
|
will catch up
|
|
Infinitive
|
N/A
|
to catch up
|
|
Gerund
|
N/A
|
catching up
|
Common Spoken Reductions
| Full Form | Spoken/Informal | Context |
|---|---|---|
|
Let us catch up
|
Let's catch up
|
Standard invitation
|
|
I have caught up
|
I've caught up
|
Perfect tense contraction
|
|
I am catching up
|
I'm catching up
|
Continuous tense contraction
|
Meanings
To reach the same quality, status, or physical position as someone or something that was previously ahead.
Socializing
To talk to someone you have not seen for some time in order to find out what they have been doing.
“We spent the whole afternoon catching up.”
“I need to catch up with my sister; we haven't spoken in months.”
Tasks and Work
To do something that you did not have time to do earlier.
“I'm staying late to catch up on some paperwork.”
“She needs to catch up on her sleep after the long flight.”
Physical Movement
To reach someone who is ahead of you by moving faster.
“Go on ahead, I'll catch up in a minute.”
“The police car eventually caught up with the stolen vehicle.”
Consequences
When something from the past (usually a mistake) finally begins to cause problems.
“His lifestyle finally caught up with him.”
“The lies he told are starting to catch up with him.”
Reference Table
| 形 | 意味 | 例 | 使い方 |
|---|---|---|---|
|
Catch up with [人]
|
誰かと同等のペース/位置に追いつく
|
I need to catch up with my friend.
|
物理的な移動、社交的な出会い
|
|
Catch up on [こと/情報]
|
見逃した話題について最新情報を得る/知る
|
I'll catch up on emails.
|
ニュース、仕事、勉強、睡眠
|
|
Catch someone up on [情報]
|
誰かに詳細を伝える/追いつかせる
|
Let me catch you up on the news.
|
情報を共有する
|
|
Catch up (社交的に)
|
しばらく会わなかった後に会って近況を話し合う
|
Let's catch up soon!
|
非公式な社交の予定
|
|
Catch up (全般的に)
|
ギャップや不足を埋める
|
He needs to catch up in class.
|
学業、仕事の文脈
|
|
Catch up with [グループ]
|
グループの現状に追いつく
|
The new software caught up with competitors.
|
業界、競争
|
フォーマル度スペクトル
I would like to schedule a time for us to discuss recent developments. (Socializing)
We should catch up soon. (Socializing)
Let's catch up! (Socializing)
We gotta link up and chat. (Socializing)
Catch Up: ギャップを埋める
物理的
- ランナーと reach the same speed
- グループと join up with others
情報
- ニュースで get updated on events
- メールで read all missed messages
- 勉強で complete missed schoolwork
社交
- 友達と meet and share news
- 家族と reconnect and talk
健康/生活
- 睡眠で get extra rest
- 雑用で complete overdue tasks
Catch Up と Keep Up の比較
「Catch Up」を正しく使う
遅れの後で、レベル、スピード、または最新情報に追いついていますか？
情報、タスク、または睡眠についてですか？
人、グループ、または物理的なものに追いつくことですか？
誰かに最新情報を伝えていますか？
Catch Up の使い方
社交
- • 友達と
- • 家族と
- • コーヒーを飲みながら
仕事/勉強
- • メールを
- • 課題を
- • 勉強を
情報
- • ニュースを
- • テレビシリーズを
- • ゴシップを
身体的/努力
- • グループに
- • 睡眠を
- • 雑用を
レベル別の例文
Wait! I need to catch up.
Can you catch up with me?
He is fast. I can't catch up.
Run! Catch up to the bus!
I caught up with my mom yesterday.
We need to catch up soon.
I have to catch up on my reading.
Did you catch up with the group?
I've been away, so I need to catch up on the news.
Let's have a coffee and catch up.
The company is trying to catch up with its rivals.
I stayed up late to catch up on my favorite show.
It took me ages to catch up on all the emails after my holiday.
Technology is moving so fast that the law can't catch up.
I finally caught up with the person who was leading the race.
We spent the evening catching up on old times.
The repercussions of his negligence finally caught up with him.
Developing nations are struggling to catch up with the West's infrastructure.
I'll leave you two to catch up; I'm sure you have a lot to talk about.
The curriculum has been updated to catch up with modern pedagogical standards.
The sheer velocity of change in the AI sector makes it nearly impossible for regulatory bodies to catch up.
There is a sense of 'catching up' that permeates the post-war literature of that era.
The ghost of his past eventually caught up with him in the most unexpected of ways.
By the time the industry caught up to the consumer demand, the trend had already shifted.
間違えやすい
Learners use 'catch up' when they are already at the same level as someone else. 'Catch up' implies a gap exists.
Sometimes confused in the context of learning or resuming a task.
Learners use 'reach' for social updates.
よくある間違い
I catch up him.
I catch up with him.
Wait for me, I catch up!
Wait for me, I'll catch up!
He catched up.
He caught up.
I catch up to you.
I'll catch up with you.
We caught up on coffee.
We caught up over coffee.
I need to catch up my work.
I need to catch up on my work.
I am catching up with my sleep.
I am catching up on my sleep.
I caught up with the news.
I caught up on the news.
I can't catch up with your speed.
I can't keep up with your speed.
Let's catch up us.
Let's catch up.
The law caught up to the technology.
The law caught up with the technology.
I need a catch up on.
I need a catch-up.
文型パターン
I need to catch up on ___.
It was great catching up with ___.
Go ahead, I'll catch up ___.
The ___ is finally catching up with ___.
Real World Usage
Hey! We need to catch up. Coffee Friday?
Let's have a quick catch-up on the project status.
I have so many emails to catch up on.
He's closing the gap! He might catch up to the leader.
Catching up with the bestie! #brunch
We need to catch up on your vaccinations.
「ギャップを埋める」とイメージしよう
I need to catch up on the news.
前置詞を忘れないで！
I caught up with my old friend.
手軽な社交の誘いに使おう
SNSでの「catch up」
目的語を多様にしてみよう
I caught up on the latest podcast.
Smart Tips
Remember: 'With' is for friends, 'On' is for ends (tasks/goals).
Think of 'Caught' like 'Bought' or 'Taught'. They all end in -ought.
Use 'catch-up' as a noun for meetings.
Switch from 'catch up' to 'keep up'.
発音
Linking
The 'ch' in 'catch' links to the 'u' in 'up', sounding like 'cat-chup'.
Past Tense
The 't' in 'caught' is often held (stop T) before the 'u' in 'up'.
Phrasal Verb Stress
I need to catch UP.
In phrasal verbs, the particle (up) usually receives more stress than the verb.
暗記しよう
記憶術
Catch the 'UP'—imagine reaching up to grab a balloon that is floating ahead of you.
視覚的連想
Picture two runners. One is far ahead, and the other is sprinting to reach them. The moment they are side-by-side, they have 'caught up'.
Rhyme
If you're behind and want to be near, catch up with those you hold dear.
Story
I was sick for a week and missed all my classes. When I returned, I had to catch up on my notes. I met my friend at a cafe to catch up with her life, and then I ran to catch up with the bus home.
Word Web
チャレンジ
Write a text message to a friend you haven't seen in a month using 'catch up'.
文化メモ
In the US, 'Let's catch up' is often used as a polite way to end a conversation, similar to 'We should do lunch,' and may not always result in a real plan.
In UK office culture, a 'catch-up' is a very common term for a brief, informal 1-on-1 meeting with a manager.
Australians use 'catch up' very frequently for any social gathering, often replacing 'meet' or 'hang out'.
From the Middle English 'cacchen' (to capture/seize) and the adverb 'up' (expressing completion).
会話のきっかけ
What is something you need to catch up on this weekend?
Who is a friend you haven't caught up with in a long time?
Do you think technology is moving too fast for people to catch up?
If you could catch up with any historical figure, who would it be?
日記のテーマ
よくある間違い
Test Yourself
After my vacation, I spent all day trying to ___ on my emails.
正しい文を選びなさい:
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
練習問題
8 exercisesI missed two days of school, so I need to catch up ___ my homework.
Yesterday, I ___ up with my old school friend.
Find and fix the mistake:
I need to catch up with my sleep.
I reached the same level as the other runners.
'Catch up' can be used as a noun.
A: 'I haven't seen you in months!' B: 'I know! We really need to ___.'
Match: 1. A friend, 2. Emails, 3. The leader
A. Social, B. Task, C. Consequence
Score: /8
Practice Bank
11 exercisesHe has fallen behind in his studies and needs to ___ up on a lot of reading.
I'll try to catch on the latest episode tonight.
正しい文を選びなさい:
英語に翻訳しなさい: 'Nos pondremos al día la próxima semana.'
これらの単語を並べ替えて文を作りなさい:
状況と前置詞を合わせなさい:
After her illness, she had to work extra hours to ___ on her assignments.
He needed me to catch up him on the project details.
正しい文を選びなさい:
英語に翻訳しなさい: 'Ella tuvo que correr para alcanzar a su perro.'
これらの単語を並べ替えて文を作りなさい:
Score: /11
よくある質問 (8)
'Catch up with' is more common for people and social situations. 'Catch up to' is often used for physical distance or reaching a specific level/number.
No, 'catch' is irregular. The past tense is always `caught up`.
It is neutral. It is perfectly fine to use in a business email (`I need to catch up on these reports`) or with a friend.
It means sleeping more than usual because you didn't sleep enough in the past few days.
Yes, when we say 'his lies caught up with him,' it means his past mistakes finally caused him trouble.
Use `catch up` (two words) as a verb. Use `catch-up` (with a hyphen) as a noun or adjective.
Yes, `catch up on the news` means reading or watching what you missed recently.
It is an informal meeting where people update each other on their progress.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Ponerse al día / Alcanzar
English uses one phrasal verb for both physical and social contexts.
Rattraper / Prendre des nouvelles
French lacks a single verb that covers 'social updates' and 'physical distance'.
Aufholen / Sich austauschen
German uses a separable prefix verb 'aufholen' which mirrors the 'up' in English.
追いつく (Oitsuku)
Japanese requires a much more formal/descriptive phrase for social catching up.
لحق بـ (Lahiqa bi)
Arabic usually requires different verbs based on the 'gap' being closed.
赶上 (Gǎnshàng)
Chinese 'ganshang' implies a sense of urgency or racing that 'catch up' doesn't always have.
Learning Path
Prerequisites
関連動画
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