Topic vs. Subject: Why は and が Confuse Beginners

Understand the difference between は (wa) and が (ga) — not as interchangeable particles, but as tools for two different jobs: topic vs. subject. By the end of this lesson, you'll know when to use each one naturally.

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Think of は as a spotlight that says: "Let's talk about this thing now."
Think of が as a pointer that says: "This specific thing is doing the action."

• は introduces the topic (what the sentence is about).
• が marks the subject (who or what performs the action).

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1. は (wa) – The Topic Marker

• は sets the context for the whole sentence.
• It often contrasts with other possibilities (implied or stated).
• It's like saying: "As for X..."

Example:
わたしは がくせい です。
Watashi wa gakusei desu.
"As for me, I am a student."

Here, わたし is the topic — the sentence is about me.

2. が (ga) – The Subject Marker

• が points to the specific doer of an action.
• It's used when the subject is new information or emphasized.
• It's like saying: "It is X who does Y."

Example:
だれが きましたか？
Dare ga kimashita ka?
"Who came?"

The answer focuses on the subject (the person who came).

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❌ Using は for new information
Wrong: だれは きましたか？
Right: だれが きましたか？ (Because you're asking who specifically.)

❌ Using が for general topics
Wrong: わたしが がくせい です。 (Sounds like "I am the student, not anyone else.")
Right: わたしは がくせい です。 (Simple statement: "I am a student.")

Rule of thumb:

• If you're introducing something new → use が
• If you're talking about something already known → use は

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Fill in the blanks with は or が.

1. きょう ___ あついですね。
   Kyou ___ atsui desu ne.
   (Talking about today's weather)

2. だれ ___ この ほんを かきましたか？
   Dare ___ kono hon o kakimashita ka?
   (Asking who wrote the book)

3. わたし ___ にほんごを べんきょうしています。
   Watashi ___ nihongo o benkyou shite imasu.
   (Saying you study Japanese)

4. あの ひと ___ せんせいです。
   Ano hito ___ sensei desu.
   (Pointing out a specific person is a teacher)

Answers:

1. は (topic: "as for today")
2. が (subject: "who specifically")
3. は (topic: "as for me")
4. が (subject: "that person specifically")

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• は = topic marker (sets the scene, often for contrast or general statements)
• が = subject marker (points to the specific doer, new info, or emphasis)

Next step:
Practice by making simple sentences about your day. Start with わたしは... for general topics. Then try asking questions with だれが... or なにが... to get comfortable with が. You'll build intuition fast!