“〜tai vs 〜tagaru”: Two Ways to Express Desire [JLPT N4]
Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026
「私は行きたい」vs「弟は行きたがる」 — your own desire vs someone else's, read from the outside.
Is 「弟は行きたい」 wrong? — a third person's wish takes 「〜たがる」
「私は日本に行きたい」 (I want to go to Japan) is fine, but 「弟は日本に行きたい」 — using 「たい」 directly for someone else's wish is actually unnatural! To say “want to do…,” Japanese chooses by “whose wish”: yourself (first person) uses 「〜たい」, a third party (he, she, my brother…) uses 「〜たがる」. This guide covers the person rules of this wish pair so you say “want” correctly.
Core: たい for yourself, たがる for a third party
Japanese wishes differ by “whose wish”:
- 〜たい = your own (first-person) wish: 私は行きたい (I want to go). Also for asking the listener (あなたは行きたい？).
- 〜たがる = a third party (he, she) wants (appears to want): 弟は行きたがる (my brother wants to go). Since you can't directly assert someone else's inner mind, use たがる (showing signs of wanting).
Attachment for both: verb ます-stem ＋ たい／たがる.
Attachment／difference
| Aspect | たい (self) | たがる (third party) |
|---|---|---|
| person | first person (I)／“you” in questions | third person (he/she) |
| example | 私は食べたい | 彼は食べたがる （he's eager to eat） |
| nuance | states the wish directly | shows signs of wanting |
| progressive | 〜たい (state) | 〜たがっている (more common) |
例句解析
- 私は日本に行きたいです。(I want to go to Japan.) — self
- あなたは何を食べたいですか。(What do you want to eat?) — asking the listener
- 弟は新しいゲームを買いたがっている。(My brother really wants a new game.) — third party
- 彼女はずっと日本語を勉強したがっていた。(She'd long wanted to study Japanese.) — third party
- 子供は外で遊びたがる。(Kids always want to play outside.) — third party (general tendency)
⚠️ Where learners slip up
① Don't mix up the person. Yourself uses たい (私は行きたい); someone else uses たがる (弟は行きたがる). Chinese uses “想” for both “I want” and “he wants,” but Japanese separates your own from a third party's wish (you can't directly assert someone else's inner mind).
② A third party often uses 「〜たがっている」 (progressive). For a specific person's current wish, 「たがっている」 (彼は行きたがっている = he wants to go (now)) is more natural and concrete than plain 「たがる」 (a general tendency).
③ Asking or quoting the person can use たい. Asking “do you want…?” uses たい (食べたいですか); directly quoting them (弟は「行きたい」と言った = my brother said “I want to go”) also uses たい. たがる is for “objectively describing a third party's shown wish.”
🔄 Compare: たい／たがる／ほしい
| Form | Person／use | Example |
|---|---|---|
| 〜たい | I want to do (action) | 行きたい |
| 〜たがる | a third party wants to do (action) | 行きたがる |
| 〜がほしい | I want (a thing) | 車がほしい |
💡 The key point in use
The core of 「たい vs たがる」 is person — a subtle point in Japanese: you can state your own wish directly (たい), but you can only judge someone else's inner mind by how it “looks” (たがる). So 「私は行きたい (I want to go)」 but 「弟は行きたがる (my brother (seems to) want to go)」. Practical point: for what a specific person wants right now, use 「たがっている」 (彼は帰りたがっている = he wants to go home), most natural. For wanting a “thing,” it's ほしい (self)／ほしがる (others). Remember “self たい, others たがる” and you'll never get the person wrong.
❓ FAQ
Q: Why is 「弟は行きたい」 unnatural?
Because Japanese doesn't use 「たい」 directly for a third party's (he, she, my brother…) wish — it uses 「たがる／たがっている」. The reason: you can't directly assert someone else's inner mind, only judge from outward signs “he seems to want to….” So “my brother wants to go” = 弟は行きたがっている (showing signs of wanting to go), not 「弟は行きたい」 (as if you'd read his mind). Only your own wish can be stated directly with 「たい」 (私は行きたい).
Q: When can a third party also use 「たい」?
Two cases: ① directly quoting them — 弟は「行きたい」と言った (my brother said “I want to go,” his own words in quotes); ② a question to the listener — （あなたは）行きたいですか (do you want to go? — asking their wish). Both are “the person themselves saying／being asked,” so たい. Only “objectively describing a third party's wish” (not a quote, not a question) requires たがる.
🖊️ Practice Quiz
Q1. 「私は日本に___です。」(I want to go to Japan) Fill the blank.
(A) 行きたがる (B) 行きたい (C) 行きたがっている (D) 行くたい
Q2. 「弟は新しいゲームを___。」(my brother wants a new game) Fill the blank.
(A) ほしいがっている (B) ほしい (C) ほしがっている (D) ほしたがっている
Q3. What is the negative of 「たい」 (don't want to)?
(A) たくない (B) たいない (C) ないたい (D) たがらない
Q4. 「彼女はずっと日本語を___いました。」(she had long wanted to learn Japanese) Fill the blank.
(A) 学びたがって (B) 学びたくて (C) 学びたいで (D) 学んでたがって
Q5. Which sentence is grammatical and natural?
(A) 私は日本語が上手になりたがっています。
(B) 私は日本語が上手になりたいです。
(C) 彼は日本語が上手になりたいです。
(D) 私は日本語が上手になりたいがります。
Answer Key
1. (B) 行きたい ── one's own (first-person) desire uses たい: 行きたいです.
2. (C) ほしがっている ── the たがる form of ほしい is ほしがる; a third person (brother) uses ほしがっている.
3. (A) たくない ── the negative of たい (an い-adjective): たくない.
4. (A) 学びたがって ── a third person's (her) desire uses たがる; ongoing → たがっていました.
5. (B) ── one's own desire uses たい: 私は…なりたいです. (A)(D) misuse たがる for oneself; (C) uses たい for a third person (unnatural without context).