How to Say “I Thought So” in Japanese: Formal and Informal Ways, Tips, and Examples

Learning a new language opens the door to exciting cultural experiences and deeper connections with people around the world. If you’re interested in Japanese, you might be wondering how to express the phrase “I thought so” in different contexts. Whether you want to convey agreement or confirm a suspicion, this guide will provide you with formal and informal expressions, along with valuable tips and diverse examples to help you master this useful phrase. So, let’s dive into the world of Japanese expressions!

Formal Ways to Say “I Thought So”

In formal situations, it’s essential to adhere to the appropriate language conventions. Instead of directly saying “I thought so,” Japanese has more indirect ways to express agreement or confirm a belief. Here are three formal expressions you can use:

1. そうですか (Sō desu ka)

This expression is useful when you want to convey agreement or show that you understand the other person’s point of view. It can be translated as “Is that so?” or “I see.” To emphasize that your assumption was correct, you may choose to add a subtle nod or an affirmative gesture.

Example:

Person A: 日本の伝統文化に興味があります。
Person B: そうですか、じゃあ、お茶道がおすすめですよ。(Person A: I’m interested in Japanese traditional culture.
Person B: Is that so? Then I recommend tea ceremony.
)

2. なるほど (Naruhodo)

This expression conveys understanding or realization. It can signify that you had a hunch or believed something to be true, similar to “I see” or “Indeed.” While it is not a direct translation of “I thought so,” it is commonly used to acknowledge someone’s statement in a thoughtful manner.

Example:

Person A: 明日の会議は大切だと思います。(Person A: I think tomorrow’s meeting is important.)
Person B: なるほど、じゃあ、しっかり準備しましょう。(Person B: I see, then let’s prepare thoroughly.)

3. 確かに (Tashika ni)

This phrase mirrors the meaning of “certainly” or “indeed” in English. It implies that you were confident in your assumption or belief. The use of this expression denotes that you had no doubt about the statement or situation being discussed.

Example:

Person A: この映画は感動的なストーリーですよ。
Person B: 確かに、見る価値がありそうですね。(Person A: This movie has an emotional storyline.
Person B: Indeed, it seems worth watching.)

Informal Ways to Say “I Thought So”

When interacting in informal situations, such as with friends or family, a more casual language style is appropriate. Here are a few informal expressions you can use to convey the meaning of “I thought so” in a friendly and relaxed manner:

4. やっぱり (Yappari)

This casual expression is commonly used among friends and peers. It implies that your initial assumption or belief was correct or turned out to be accurate. Equivalent to “as I expected,” it conveys a sense of affirmation with a touch of mild surprise.

Example:

Person A: 明日雪が降るそうだよ。(Person A: I heard it’s going to snow tomorrow.)
Person B: やっぱり、寒くなりそうだね。(Person B: As I expected, it seems it will get cold.)

5. 当然だろう (Tōzen darō)

This expression is casual and can be used when you want to convey a sense of obviousness. As a way to say “of course” or “obviously,” it signifies that your belief aligns with the speaker’s statement or situation discussed.

Example:

Person A: 会社のミーティングが終わった。(Person A: The company meeting is over.)
Person B: 当然だろう、その後はフリータイムだ。(Person B: Of course, afterwards it’s free time.)

6. やっぱ (Yappa)

This is a shortened, more casual version of “やっぱり” (yappari). It shares the same meaning and usage, expressing that you believed or suspected something to be true.

Example:

Person A: この本、おもしろいよ。(Person A: This book is interesting.)
Person B: やっぱ、読んでみたいな。(Person B: As I suspected, I’d like to read it.)

Tips for Natural Usage

Now that you’re familiar with various ways to express “I thought so” in Japanese, here are a few tips to help you sound more natural:

1. Pay Attention to Context

Consider the situation and choose the appropriate expression accordingly. Formal expressions are more suitable in professional environments or when conversing with someone older or in a position of authority. Informal expressions work well in casual settings or when conversing with friends or family.

2. Observe Politeness Levels

When speaking Japanese, it’s essential to respect politeness levels. Adjust your language accordingly if you’re interacting with individuals of higher social status or in more formal situations. Use polite forms of speech and expressions to maintain a respectful tone.

3. Combine with Facial Expressions and Body Language

In Japanese culture, non-verbal cues, such as facial expressions and gestures, can complement your words and add emphasis. A subtle nod, a smile, or a raised eyebrow can help convey your agreement or reinforce your belief while interacting with others.

Conclusion

Congratulations! You’ve learned several ways to say “I thought so” in Japanese, both formally and informally. Remember to choose the appropriate expression based on the context and the people you are conversing with. In formal settings, opt for expressions like “そうですか (Sō desu ka)” or “なるほど (Naruhodo).” For informal situations, go for expressions like “やっぱり (Yappari)” or “当然だろう (Tōzen darō).” Pay attention to the nuances of each expression, and be mindful of using polite forms of speech when necessary.

Language learning is an exciting journey, and embracing new expressions helps foster authentic connections and understanding. So, keep practicing, exploring, and enjoy your Japanese learning adventure!

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