Common は vs が Mistakes English Speakers Make (And How to Fix Them)

You studied the rules. You know は marks the topic and が marks the subject. You even passed a grammar quiz on it. And then — in real conversation — you still reach for the wrong one.

You are not alone. は vs が is one of the most discussed grammar points in Japanese learning, yet even N3-level learners stumble on it every day. The reason is not that the rules are wrong — it is that English has no direct equivalent for either particle, so your brain keeps defaulting to patterns that work in English but fail in Japanese.

This article does not re-explain the basic rules from scratch. Instead, it zeroes in on the six most common real-world mistakes English speakers make, explains exactly why each one happens, and shows you how to fix it with natural example sentences.

Yuka

I made every single one of these mistakes when I was learning. The good news? Once you understand why you are making them, they click really fast.

Why は and が Still Trip You Up

English encodes very little information grammatically. Whether something is new or already known, the subject of a sentence or just the topic — English handles all of this through word order, stress, and context rather than dedicated particles.

Japanese does the opposite. It uses particles to signal these distinctions every single time. は and が are not just two ways to mark the subject — they carry completely different pragmatic weight:

• は says: “You already know what I am talking about. Here is information about it.”
• が says: “Here is new information — specifically, this is the thing that does/is X.”

Because English does not force you to make this choice explicitly, your brain skips it — and you end up picking the particle that “feels right” based on instinct shaped by English grammar. Let us look at where that goes wrong.

One more thing before we dive in: these particles are not about grammar for its own sake. Native Japanese speakers notice the wrong particle the way English speakers notice the wrong article (“a” vs “the”). It does not always block understanding, but it does signal that something is off. Getting は and が right is one of the clearest markers of fluency — and it is very learnable.

Mistake 1 — Using が to Introduce a Known Topic

The mistake: After a noun has already been introduced, learners continue to mark it with が instead of switching to は.

Why it happens: In English, you keep saying “he” or use the same noun repeatedly regardless of whether it is new or established in the conversation. There is no particle switch. So learners over-apply が because it feels like the grammatically “safe” subject marker.

ねこがいます。ねこはさかなをたべます。
Neko ga imasu. Neko wa sakana wo tabemasu.
“There is a cat. The cat eats fish.”

The first sentence introduces the cat with が (new information). The second sentence talks about what the cat does — the cat is now the established topic, so は takes over. Keeping が in the second sentence sounds unnatural and slightly over-emphatic, as if you are insisting “it is specifically the cat (not something else) that eats fish.”

Here is another common version of this mistake in discourse:

❌ 昨日、友達に会いました。友達が面白い人です。
(Kinou, tomodachi ni aimashita. Tomodachi ga omoshiroi hito desu.)
“Yesterday I met a friend. The friend is an interesting person.”

✅ 昨日、友達に会いました。友達は面白い人です。
(Kinou, tomodachi ni aimashita. Tomodachi wa omoshiroi hito desu.)
“Yesterday I met a friend. The friend is an interesting person.”

Once the friend has been mentioned, they become the shared topic of discussion. The second sentence describes this known person — that calls for は, not が.

Mistake 2 — Using は When Presenting New Information

The mistake: Answering a “who did X?” or “what is X?” question with は instead of が.

Why it happens: Learners memorise は as “the subject marker” and apply it reflexively to any subject slot. They do not yet sense that が has a special role in presenting new, identifying information.

When someone asks だれがきましたか？ (Dare ga kimashita ka?) — “Who came?” — the answer needs が because you are filling in new information. Using は instead creates a subtle topic shift that does not answer the question directly.

Think of が here as the particle that points a spotlight: it was specifically Tanaka. は would sound like you are changing the subject to talk about Tanaka more generally.

This mistake also appears frequently in self-introductions. Beginners often say:

❌ 私の名前は田中です。私は日本人です。私は東京に住んでいます。
(Watashi no namae wa Tanaka desu. Watashi wa nihonjin desu. Watashi wa Toukyou ni sundeimasu.)

This is not wrong per se — は is correctly used here to state facts about yourself as a known topic. However, the first introduction of yourself often benefits from が in certain contexts, such as when filling out an identification role (e.g., in a group: 田中と申しますが、本日の発表者が私です。). Learners often do not realise this nuance exists.

The practical takeaway: whenever you are answering a direct “who?” or “which?” question, default to が for the answer. If you are simply continuing to describe something already named, reach for は.

Rei

A good way I remember this: if the question uses が, the answer almost always uses が too. The question sets up the identification slot, and が fills it.

Mistake 3 — は vs が in Questions (General vs Specific)

The mistake: Using は in a question when you mean to ask “which specific thing?” and using が when you want to ask a general question about a known topic.

Why it happens: English question structure does not change depending on whether you are asking about a known topic or an unknown identifier. “What do you like?” and “What is it that you like?” feel nearly identical in English. In Japanese they are structurally different.

なにがすきですか？ (Nani ga suki desu ka?) — “What do you like?”
This asks you to identify something from scratch. が is required because the answer will be new information.

すしはすきですか？ (Sushi wa suki desu ka?) — “Do you like sushi?”
Sushi is already in the conversation (or just introduced as the topic). は frames sushi as the thing being discussed and asks for a yes/no judgment about it.

The key insight: は + question word (何, 誰, どこ) sounds unnatural because は marks something as already known, but question words are by definition unknown. This is why you almost never see は directly before a question word.

There is one edge case worth noting: は can appear with a question word when the topic is being set for a broader conversational frame. For example, それについては何が言えますか？(Sore ni tsuite wa nani ga iemasu ka?) — “As for that matter, what can you say?” Here は attaches to the prepositional phrase それについて, not directly to the question word 何. The question word itself still takes が. This is an advanced nuance, but knowing it prevents over-correction.

Mistake 4 — は vs が in Relative Clauses

The mistake: Using は inside a relative clause, which is one of the most reliable grammar errors that marks a learner as still developing.

Why it happens: English relative clauses look structurally similar to Japanese ones on the surface. “The person who called me” maps onto 私に電話した人. Inside that embedded clause, English uses “who” (which functions like a subject), so learners reach for は thinking it does the same job.

The rule here is clear and consistent: inside a relative clause, always use が (or を), never は. This is because は is a discourse-level particle — it sets the frame for an entire sentence or utterance. Relative clauses are subordinate and embedded; they cannot carry their own topic frame. が simply marks the grammatical subject of that embedded verb.

Examples with full sentences:

✅ 私が作った料理はおいしい。(Watashi ga tsukutta ryouri wa oishii.)
“The dish that I made is delicious.”
Inside the relative clause: 私が (I = subject of “made”). Outside: 料理は (dish = topic of the main clause).

✅ あなたが好きな映画を教えてください。(Anata ga suki na eiga wo oshiete kudasai.)
“Please tell me the movie that you like.”
Again, が inside the relative clause.

Yuka

A native speaker once told me: if you see は inside a relative clause, the sentence is broken. Full stop. That rule never has exceptions in standard Japanese.

Mistake 5 — は for Contrast vs が for Exhaustive Identification

The mistake: Missing the contrastive nuance of は — or missing the exhaustive/exclusive nuance of が — and treating both as neutral subject markers.

Why it happens: This is a purely pragmatic distinction that has no English grammar equivalent. English relies on tone, stress, and context (“I like coffee” stressed vs unstressed). Japanese encodes this directly in the particle choice.

The contrastive は often implies an unspoken “but” or “as opposed to other things.” When you say コーヒーは好きです (Koohii wa suki desu), a Japanese listener may hear “…but maybe I am not sure about tea.” That unspoken implication is often unintentional for learners who are just trying to say “I like coffee.”

The exhaustive が pins down exactly which thing fits the description — it is exclusive. コーヒーが好きです (Koohii ga suki desu) directly identifies coffee as the specific preference, with no implied contrast with other drinks.

In casual conversation the distinction softens, but in careful speech or writing it matters. Watch for は carrying a hidden “but” before you use it in situations where no contrast is intended.

Here is a classic dialogue that shows the pragmatic gap clearly:

Speaker A: ビールは飲みますか？(Biiru wa nomimasu ka?) — “Do you drink beer?”
Speaker B: ビールは飲みません。(Biiru wa nomimasen.) — “Beer (I do not drink).” [Implied: but I might drink other things.]

vs.

Speaker A: 何が飲みたいですか？(Nani ga nomitai desu ka?) — “What do you want to drink?”
Speaker B: 水が飲みたいです。(Mizu ga nomitai desu.) — “It is water [specifically] that I want to drink.”

In the first exchange, は in Speaker B’s reply signals a contrast — beer is out, but the door is open for other options. In the second exchange, が in Speaker B’s reply closes the identification: water is the specific answer to “what?”

Mistake 6 — Dropping は or が When the Sentence Needs Both

The mistake: In sentences that require both a topic (は) and a separate grammatical subject (が), learners drop one or confuse the two roles.

Why it happens: English sentences typically have only one subject. Japanese sentences can have both a topic and a subject simultaneously, which has no neat English analogue. When learners see two nouns needing particles, they often default to one particle for both.

The classic example is the elephant sentence:

✅ 象は鼻が長い。(Zou wa hana ga nagai.)
“As for elephants, [their] noses are long.”
Topic: elephants (は). Subject of the adjective “long”: nose (が).

This double-particle structure appears constantly in natural Japanese — especially with body-part descriptions, emotional states, and ability expressions:

✅ 私は日本語が好きです。(Watashi wa nihongo ga suki desu.)
“As for me, Japanese is [what I] like.”
Topic: I (は). Subject of “is liked”: Japanese (が).

✅ 彼女は歌が上手です。(Kanojo wa uta ga jouzu desu.)
“As for her, singing is skilful.” = “She is good at singing.”
Topic: she (は). Subject of “is skilful”: singing (が).

This double-structure also appears with want/desire expressions and ability structures:

✅ 私は車が欲しいです。(Watashi wa kuruma ga hoshii desu.)
“As for me, a car is [what I] want.” = “I want a car.”
Note: 欲しい (hoshii — to want [something]) always takes が for the desired object, not を. This catches many learners off guard.

✅ 彼は英語が話せます。(Kare wa eigo ga hanasemasu.)
“As for him, English [is something he] can speak.” = “He can speak English.”
Potential (can) forms — できる (dekiru), 〜られる — typically take が for the object of the ability.

Learning to recognise these “Xはが” sentence patterns as a single unit — rather than trying to parse them word by word — is one of the fastest ways to improve your natural particle use.

Rei

Once I stopped trying to map these onto English subject-verb sentences and started seeing は as a “frame setter” and が as the thing actually doing or being the predicate, double-particle sentences stopped confusing me.

Practical Tips for Getting は and が Right

Before you look at the decision flowchart below, here are four practical habits that will help you internalise は and が faster than any grammar rule chart alone:

1. Shadowing with attention to particles. When you shadow native Japanese audio (news, dramas, podcasts), pay close attention every time you hear は or が. Do not just mimic the sound — actively notice what the noun refers to and whether it is new or known information. Over time, your ear will start to calibrate.
2. Colour-coding in your notes. When you practise writing Japanese sentences, highlight は in one colour and が in another. Reviewing your own writing this way makes particle patterns visible at a glance.
3. Read-aloud error correction. Write a short paragraph (5–8 sentences) in Japanese, then swap every は for が and every が for は. Read the broken version aloud. You will immediately feel how wrong many of them sound — and that muscle memory helps you catch errors in real time.
4. Focus on sentence-initial frames. If your sentence starts with a time expression, place name, or general noun followed by は, you are almost certainly correct (e.g., 今日は…, 東京は…). That “topic-setting は” pattern is the easiest one to master first and use as your anchor.

Decision Flowchart: How to Choose は or が

When you are unsure which particle to use, walk through these questions in order:

START: You need to mark a noun in your sentence.
        |
        v
[1] Are you inside a relative clause (modifying another noun)?
        |YES --> Use が (never は inside relative clauses)
        |NO  --> continue
        |
        v
[2] Is this noun answering a "who/which/what?" question?
        |YES --> Use が (new identifying information)
        |NO  --> continue
        |
        v
[3] Is this noun already known to both you and the listener,
    OR are you setting a general topic frame?
        |YES --> Use は (established topic)
        |NO  --> continue
        |
        v
[4] Does your sentence have TWO noun roles?
    (e.g., "As for X, Y is adjective")
        |YES --> X = は (topic), Y = が (subject of predicate)
        |NO  --> continue
        |
        v
[5] Are you implying a contrast or "as for X (but not Y)"?
        |YES --> Use は (contrastive)
        |NO  --> Use が (neutral new information / subject)

Quick Quiz: は or が?

Fill in the blank with は or が. Answers follow each question.

1. A: 誰___来ましたか？ B: 山田さん___来ました。
(A: Dare ___ kimashita ka? B: Yamada-san ___ kimashita.)
Answer: A: 誰が来ましたか？ — B: 山田さんが来ました。
Reason: Both are identifying new information. The question and answer pair uses が.

2. 私___作った料理___おいしいです。
(Watashi ___ tsukutta ryouri ___ oishii desu.)
Answer: 私が作った料理はおいしいです。
Reason: が inside the relative clause; は marks the dish as the topic of the main clause.

3. A: コーヒーと紅茶、どちら___好きですか？ B: 紅茶___好きです。
(A: Koohii to koucha, dochira ___ suki desu ka? B: Koucha ___ suki desu.)
Answer: A: どちらが好きですか？ — B: 紅茶が好きです。
Reason: Identifying preference from two options = exhaustive が.

4. 彼___目___青いです。
(Kare ___ me ___ aoi desu.)
Answer: 彼は目が青いです。
Reason: “He” is the topic frame (は); “eyes” are the subject of “are blue” (が).

5. 昨日、映画を見ました。映画___とても面白かったです。
(Kinou, eiga wo mimashita. Eiga ___ totemo omoshirokatta desu.)
Answer: 映画はとても面白かったです。
Reason: The movie was introduced in the previous sentence — it is now the established topic.

How did you do? If you got 4 or 5 right, your particle instincts are on track. If a particular question stumped you, go back to the mistake section that covers that pattern.

Which mistake do you make most often? Leave a comment below — I read every one and reply when I can!

Keep Learning

Ready to go deeper on particles and sentence structure? These articles continue right where this one leaves off:

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About the Author

Daisuke is the creator of JP YoKoSo — a Japanese learning site for English speakers. Every article is written to explain Japanese clearly, with real examples, grammar notes, and practical tips for learners at every level.

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