なぜ/どうして

Why

Level 1Sounds Like naze/doushite

Both なぜ and どうして mean 'why'. なぜ is formal and objective, while どうして is more conversational and can express emotion or surprise.

How It Works

In Japanese, there are several ways to ask 'why', each with a specific nuance and register.

1. なぜ (Naze):
This is the most formal and objective version. It is primarily used in written Japanese, news reports, and academic contexts. When used in casual speech, it can sound very serious, dramatic, or even like a cold interrogation. It asks for a logical or scientific reason.

2. どうして (Doushite):
This is the most versatile and common form in spoken Japanese. It carries a softer, more subjective nuance. It is often used when the speaker is surprised, concerned, or emotionally involved in the question. Unlike なぜ, どうして can also be used to ask 'how' (by what means) depending on the sentence.

3. Sentence Structure:
Both words usually appear at the beginning of a sentence or right before the verb. They are often paired with the explanatory ending to signal that the speaker is seeking a deeper explanation.

4. Register Comparison:

  • なぜ: Formal / Written / Academic
  • どうして: Polite to Casual / Spoken
  • なんで: Very Casual / Colloquial (use with caution)

Examples (5)

  1. なぜ地球は丸いのですか。

    Why is the Earth round?

    Word by Word: Why Earth (topic) round (explanatory) is (question)?

    Uses なぜ because it is a scientific, objective question about a fact.

  2. どうして昨日来なかったんですか。

    Why didn't you come yesterday?

    Word by Word: Why yesterday come-did-not (explanatory) is (question)?

    Uses どうして to ask for a personal reason in a polite, conversational way.

  3. どうしてそんなことを言うの？

    Why (how come) would you say such a thing?

    Word by Word: Why that-kind-of thing (object) say (question)?

    Uses どうして to express emotion or surprise at someone's statement.

  4. なぜか分からないけど、今日はとても疲れています。

    I don't know why, but I am very tired today.

    Word by Word: Why-question don't-know although, today very tired-am.

    なぜか is a common set phrase meaning 'for some reason' or 'somehow'.

  5. どうして漢字を覚えましたか。

    How did you memorize the kanji? (or Why did you...)

    Word by Word: How/Why kanji (object) memorized (question)?

    In this context, どうして can ask for the method (how) or the reason (why).

Common Mistakes

  • Using なぜ in casual conversation with friends.

    なぜ遅れたの？
    どうして遅れたの？ (or なんで遅れたの？)

    Using なぜ with friends can sound overly stiff or like you are interrogating them. どうして is much more natural for daily interactions.

  • Using なぜ to ask for a method (how).

    なぜ駅へ行きますか。
    どうやって駅へ行きますか。

    なぜ only asks for a reason. If you want to ask 'how' to get somewhere, use どうやって or sometimes どうして. なぜ would imply you are asking for the reason for going to the station.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

なぜ/どうしてLevel 1Why

Learn This First

To use 'why' (なぜ/どうして) effectively, you need to understand how to form basic Japanese sentences and how to mark a sentence as a question using the particle 'か'. Familiarity with other basic question words also helps establish the pattern of where interrogatives are placed in a sentence.

Words in This Pattern

なぜどうして