15秒でわかる
- A polite way to say no or disagree with someone.
- Softer than a direct 'no' to keep conversations friendly.
- Works in almost any situation, from work to home.
意味
This is a soft way to say 'no' when you disagree or think someone is wrong. It sounds much friendlier than just saying a flat 'no'.
主な例文
3 / 6Checking a schedule with a friend
I don't think so; the movie starts at eight, not seven.
I don't think so; the movie starts at eight, not seven.
A boss asking if a project is finished
I don't think so, I still need one more hour.
I don't think so, I still need one more hour.
Texting about a party invitation
I don't think so, I'm feeling pretty tired tonight.
I don't think so, I'm feeling pretty tired tonight.
文化的背景
Brits use this as a 'polite buffer'. It's often followed by 'actually' to soften the correction even further. In US business culture, this is used to keep meetings 'positive'. It's a way to say 'no' without sounding like you are not a 'team player'. English learners in Japan find this phrase very natural because it matches the Japanese preference for indirectness and 'sō' (so). Learners from direct cultures might find this phrase 'weak'. It's important to learn that in English, it's not weak; it's socially skilled.
The 'Actually' Add-on
Add 'actually' at the end to sound like a native speaker: 'I don't think so, actually.'
Avoid 'I think no'
This is the #1 mistake for learners. Even if your language says 'I think no', English never does!
15秒でわかる
- A polite way to say no or disagree with someone.
- Softer than a direct 'no' to keep conversations friendly.
- Works in almost any situation, from work to home.
What It Means
I don't think so is your go-to tool for polite disagreement. It means you have a different opinion or believe something is incorrect. It is softer than a blunt No. It suggests you are sharing your personal thought, not a hard fact. This makes people feel less attacked during a conversation.
How To Use It
Use it when someone asks a question or makes a statement you disagree with. You can use it alone as a full sentence. You can also add a reason after it. For example: I don't think so, because the store is closed. It works perfectly in spoken English and casual emails. Just keep your voice calm and steady.
When To Use It
Use it at work when a boss suggests a deadline that is too short. Use it with friends when they ask if you like a weird movie. It is great for checking facts politely. If a friend says, "Is it raining?", and you see sun, say I don't think so. It keeps the vibe chill and friendly.
When NOT To Use It
Avoid it in high-stakes emergencies. If someone asks, "Is the building on fire?", don't be polite—just say Yes!. Also, don't use it if you want to be 100% firm and unmoving. It can sometimes sound a bit unsure. If you are certain, a simple No might be better. Don't use it to be sarcastic unless you know the person well.
Cultural Background
English speakers, especially in the UK and US, often avoid direct confrontation. We love to 'buffer' our negatives. I don't think so is a classic 'buffer' phrase. It protects the other person's feelings. It’s a way of being 'nice' even when you are saying someone is wrong. It’s the ultimate social lubricant for small disagreements.
Common Variations
If you want to be even softer, try I'm not so sure. For a more casual vibe, you might hear I don't think so, buddy. In professional settings, people often say I don't believe so. If you are feeling extra polite, add Actually at the beginning. Actually, I don't think so sounds very sophisticated and gentle.
使い方のコツ
This phrase is incredibly versatile and fits into almost any social or professional situation. The only 'gotcha' is to ensure your body language matches the polite intent—a smile or a neutral face helps keep it friendly.
The 'Actually' Add-on
Add 'actually' at the end to sound like a native speaker: 'I don't think so, actually.'
Avoid 'I think no'
This is the #1 mistake for learners. Even if your language says 'I think no', English never does!
Softening the Blow
Always follow 'I don't think so' with a reason if you want to be extra polite.
例文
6I don't think so; the movie starts at eight, not seven.
I don't think so; the movie starts at eight, not seven.
Correcting a small detail politely.
I don't think so, I still need one more hour.
I don't think so, I still need one more hour.
Professional way to deliver bad news.
I don't think so, I'm feeling pretty tired tonight.
I don't think so, I'm feeling pretty tired tonight.
Declining an invitation gently.
You want me to jump in the frozen lake? I don't think so!
You want me to jump in the frozen lake? I don't think so!
Used for a humorous, firm refusal.
I don't think so, honey, you've had enough sugar.
I don't think so, honey, you've had enough sugar.
Soft discipline from a parent.
Is there meat in this? I don't think so, but let me check.
Is there meat in this? I don't think so, but let me check.
Expressing uncertainty politely.
自分をテスト
Complete the sentence to politely disagree.
A: Is the party starting at 6 PM? B: I ____ _____ so. I think it starts at 8 PM.
We use 'don't think' for present simple opinions.
Which response is the most polite way to say 'no'?
Do you want to go to the gym now?
'I don't think so' is the standard polite form.
Fill in the missing part of the dialogue.
Boss: Is the report finished? You: I ____ _____ __, but I will finish it in ten minutes.
Use the present tense to describe your current belief.
Match the phrase to the situation.
When should you use 'I don't think so'?
It's perfect for polite social refusals.
🎉 スコア： /4
ビジュアル学習ツール
Polite vs. Direct
練習問題バンク
4 問題A: Is the party starting at 6 PM? B: I ____ _____ so. I think it starts at 8 PM.
We use 'don't think' for present simple opinions.
Do you want to go to the gym now?
'I don't think so' is the standard polite form.
Boss: Is the report finished? You: I ____ _____ __, but I will finish it in ten minutes.
Use the present tense to describe your current belief.
When should you use 'I don't think so'?
It's perfect for polite social refusals.
🎉 スコア： /4
よくある質問
14 問No, it is actually one of the most polite ways to say no in English.
Yes, but you must say what 'that' is. 'I don't think so' is better when you don't want to repeat the whole sentence.
'I don't think so' is more about being polite; 'I doubt it' is more about being skeptical.
Yes, it is very common in professional emails to gently disagree.
It's used for dramatic effect. In real life, it sounds very arrogant or old-fashioned.
Yes, it's a very safe way to disagree with a superior.
Put your tongue between your teeth and blow air out without using your voice.
No, we say 'I hope not'. 'Think' and 'Hope' work differently!
Yes, it is used globally in all major English dialects.
You can still use it to be polite, or you can say 'Definitely not' if you want to be firm.
No, 'so' here means 'that thing you just said'.
Yes, it's a very common way to answer that question.
It is neutral. It works in almost any situation.
The opposite is 'I think so'.
関連フレーズ
I doubt it
similarI think it is unlikely.
Not really
similarA casual 'no'.
I'm afraid not
similarA very polite 'no'.
I think so
contrastA polite 'yes'.
I don't believe so
specialized formA firmer 'no'.
