Particle は — sentence topic | N5 Grammar

Pattern	Formation with ～は～	Structural example	Notes
Topic (topic)	N + は + Clause	私は学生です。	は is read as わ; presents a general topic to comment on.
Time/location frame	Time/Location + は + ...	今日は忙しい。/ 日本では桜が有名だ。	Sets the context: “as for today,” “in Japan.”
Contrast/comparison	N1 は ... が／けど、N2 は ...	コーヒーは好きだが、紅茶は飲まない。	は emphasizes contrast.
Generalization	N は + General property	日本は島国だ。	States a general property.
Definition/emphasis	N + とは + ... (is...)	自由とは責任だ。	とは is a variant with は, used for definitions.
Combination with other particles	で＋は／に＋は／と＋は ...	結果では、Aが最適だ。	Other particle + は to emphasize the frame.

Topic-marking: は marks “what will be talked about,” not necessarily the grammatical subject.
Contrast: When there are multiple は in the same sentence/passage, each は creates an implicit contrast pair.
Generalization: Used for general statements (日本は…, 犬は…が好きだ, etc.).
Frame-setting: With time/location, は sets the scope of the utterance (今日は…, 日本では…).
Different from が: が marks a new/focused subject, while は promotes something to the topic (already known) or adds contrastive emphasis.

私はベトナム人です。
I am Vietnamese.
日本は山が多い。
Japan has many mountains.
今日は会議がない。
There is no meeting today.
寿司は食べますが、ラーメンはあまり食べません。
I eat sushi, but I don’t eat ramen much.
この本は面白いが、高校生には難しい。
This book is interesting, but difficult for high school students.
日本では春に桜が咲く。
In Japan, cherry blossoms bloom in spring.
私は泳げますが、兄は泳げません。
I can swim, but my older brother cannot.

When introducing new information, Japanese speakers tend to use が; once a shared context is established, they switch to は.
Two or more は in the same sentence naturally express comparison/contrast.
は after other particles (には/では/とは) adds the nuance “as for/in terms of …”.
In questions, は often asks about a general topic; use が to ask specifically “who/what.”
In conversation, shifting topics with “ところで、〜は…？” is very natural.

Pattern	Meaning	Main difference	Short example
は	Topic/contrast marker	Known information/frame-setting	私は学生。
が	Subject/focus, introduces new info	Emphasizes “who/what” appearing for the first time	誰が来た？太郎が来た。
も	Also/both	Adds to the set of subjects/objects	私も学生。
こそ	Exactly/indeed	Strong emphasis, spoken/written	君こそ英雄だ。
とは	Definition/emphasis about	More formal than は, nuance of “is…”	幸福とは何か。

Pronunciation: は is read as わ when used as a particle.
In relative clauses, avoid は unless you intend contrast; が/を/に are usually more natural.
Turn the object into the topic: この本を読みました → この本は読みました。
In writing, use は to structure an argument: 前提は…, 問題は…, 結論は…

Wrong: 誰は来ましたか → Right: 誰が来ましたか (interrogatives + が).
Confusing は with が when introducing new information: “新しい先生が来ました” is more natural than using は.
Using は in a subordinate clause without contrast sounds awkward: 私は[昨日は買った本]を読む → omit は in the subordinate clause.
Too many は in a row makes the sentence heavy; consider reducing or switching to が/を.
JLPT often tests nuance contrasts: AはBが… (A has B…) vs AがBは… differ in focus.