〜が

The particle が marks the grammatical subject and highlights new, important, or emphasized information. While は sets the topic ("as for X..."), が identifies the subject with focus ("X is the one that..."). Understanding the は/が distinction is one of the most important aspects of natural Japanese.

This is a foundational pattern that you will use from day one of your Japanese studies.

When to Use#

• Answering "who/what" questions: 誰が来ましたか → 母が来ました
• Introducing new information: あ、バスが来た！ (Oh, the bus is here!)
• With predicates like 好き, わかる, できる: 日本語がわかります (I understand Japanese)

When NOT to Use#

• When continuing to talk about an already-established topic — switch to は
• In subordinate clauses where the subject is the same as the main clause — は is more natural

Example Sentences#

• 信号が赤です。 — The traffic light is red.
• 空が青いです。 — The sky is blue.
• 風が強いです。 — The wind is strong.

Practice#

Try reading these sentences aloud, then check the translation and vocabulary:

Common Mistakes#

1. Using が for established topics — Once something is introduced, switch to は. ✗ 「猫がいます。猫が黒いです」→ ✓ 「猫がいます。猫は黒いです」
2. Forgetting が with adjectives of desire/ability — Patterns like 好き, ほしい, わかる, できる require が for the object: 寿司が好きです, not 寿司を好きです.

Related Patterns#

• 〜があります (there is (inanimate)) — Next step
• 〜がいます (there is (animate)) — Next step
• 〜は (topic marker) — Compare