brain

HSK 5 | noun | chronic disease; long-term illness that persists over time

HSK 4 | verb / adverb | to compare; relatively; fairly

HSK 5 | noun/adjective | economy, economics; economical, affordable

HSK 3 | noun / measure word | a unit of time (minute), a score point, or a fraction

HSK 4 | verb | to transfer data from the internet to a device

HSK 4 | phrase | used to introduce a comparison

We are given a list of tasks, each with an associated difficulty level, and we need to produce three different sequences in which all tasks are completed. Each sequence must respect the rule that tasks can only be reordered if their difficulties are equal.

Discuss Chinese history with the vocabulary and grammar of historical narrative, engaging with dynasties, revolutions, and transformative events.

HSK 4 | verb / noun | believing in someone's reliability or integrity

HSK 5 | verb/noun | to invest capital; investment in financial or economic contexts

HSK 5 | adjective | firm and well-grounded; not reckless or volatile

HSK 4 | verb/noun | to work together toward a shared goal

HSK 5 | conjunction | a logical connector indicating a further step or consequence

JLPT N4 kanji 肩 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

HSK 3 | noun | dormitory, student housing, staff quarters

HSK 4 | n/v | a formal vote to choose a person for a position

N1 grammar pattern 〜べく: a formal literary purposive expressing 'in order to ~, for the purpose of ~' — the written formal equivalent of ために.

HSK 2 | noun | a point in time, a moment, an occasion (contrast with 时间)

HSK 4 | verb | to take on responsibility or a burden

HSK 5 | adjective | complex, complicated, intricate

HSK 3 | grammar pattern | 把 sentence with result complement 完 indicating complete disposal

HSK 4 | adjective/adverb | referring to the whole rather than parts

HSK 4 | noun | the underlying base upon which something is built or developed

Express proportional and progressive change using 越...越 and 越来越 at B1 level.

HSK 4 | noun | boss; owner; employer

父 (father): 4 strokes, JLPT N5. On: フ. Kun: ちち.

気 (spirit, mood): 6 strokes, JLPT N5. On: キ、ケ. Kun: none.

Sindarin subject pronouns: independent forms for emphasis and suffix forms attached to verbs; all 6 persons with attested examples.

HSK 5 | noun/adjective | a person or organization's public image; also vivid/concrete representation

HSK 3 | adjective | feeling cheerful and satisfied

HSK 4 | verb | to successfully deal with a difficulty or challenge

JLPT N4 kanji 冬 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

HSK 1 | greeting phrase | standard response to 谢谢

子 (shi/su/ko): child. JLPT N5 kanji.

〜てしまう: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

JLPT N4 kanji 番 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

HSK 4 | adjective | able to adapt easily to different conditions or requirements

二 (two): 2 strokes, JLPT N5. On: ニ. Kun: ふた、ふた-つ.

Develop the vocabulary and oral patterns for delivering formal presentations, reports, and interactive talks in Chinese professional and academic settings.

HSK 2 | adjective phrase | interesting, fun, enjoyable

HSK 5 | verb | to make something stronger, more robust, or more effective

HSK 3 | noun | a facility where aircraft take off and land

HSK 3 | adverb | singles out one item from a group as deserving special emphasis

HSK 4 | grammar pattern | expressing a logical conclusion based on an accepted premise

HSK 1 | verb | to ask, to inquire

HSK 7 | verb | surgical closure of wounds or incisions using sutures or staples

HSK 5 | verb / adjective / noun | to deny; to negate; negative

足 (foot, leg): 7 strokes, JLPT N5. On: ソク. Kun: あし、た-りる.

HSK 3 | verb + complement | verb-result compound meaning to write something wrong

花 (flower): 7 strokes, JLPT N5. On: カ. Kun: はな.

HSK 4 | verb/noun | the act of choosing or a choice made

HSK 3 | noun | an emotional bond or feeling between people

HSK 6 | verb | to hold back or suppress the spread or growth of something

Form and use the imperfect (ongoing past) and future tenses for all four conjugations and esse.

HSK 5 | noun/preposition | basis; grounds; according to; based on

町 (town, district): 7 strokes, JLPT N5. On: チョウ. Kun: まち.

HSK 3 | noun | a card used for credit-based payment

HSK 4 | verb | to save or reduce use of resources

Master the Latin perfect tense using the 3rd principal part, and distinguish completed from ongoing past action.

Order food, ask questions, and handle the bill in Chinese with practical restaurant vocabulary and grammar.

犬 (dog): 4 strokes, JLPT N5. On: ケン. Kun: いぬ.

HSK 3 | noun / adjective | a mistake or wrong action; incorrect

HSK 5 | noun | the livelihood and basic needs of the common people

Sindarin vocabulary for warfare, weapons, armor, military ranks, and battle terms — sourced from Tolkien's use of Sindarin in LotR's war contexts.

Learn how to use 〜に反して (ni hanshite) to express 'contrary to' or 'against' expectations, rules, or wishes. Includes structure, nuance, examples, and comparisons.

Consolidate all B2 grammar and vocabulary, assess your current competency level, identify common B2 errors, and plan your pathway to C1.

HSK 1 | verb | to see, to catch sight of

Master six N3 scope and contrast patterns: 〜だけでなく〜も, 〜ばかりでなく, 〜どころか, 〜わけではない, 〜とは限らない, and 〜にほかならない — with full nuance analysis.

HSK 5 | adjective | severe; grim; daunting; stern

Master the second declension: masculine -us/-er nouns and neuter -um nouns, with the vocative and neuter rules.

N1 grammar: comparing the literary particle 〜すら with the more neutral 〜でさえ and casual 〜でも for 'even.' Register hierarchy, emphatic force, and the unique 〜さえ〜ば conditional.

HSK 3 | noun | dish, course of food; vegetable broadly — general term covering both cooked dishes and raw produce

HSK 4 | verb/noun | to clarify or describe something; a written explanation or instruction manual

HSK 1 | adjective/pronoun | interrogative asking about condition or opinion

HSK 1 | adjective | wrong, incorrect, mistaken

We are given an array of integers. In one move, we choose a value x that is currently present, earn x points from deleting one occurrence of it, and all occurrences of x - 1 and x + 1 disappear from the array as a consequence.

HSK 5 | noun | established rules, regulations, or institutional arrangements

月 (moon, month): 4 strokes, JLPT N5. On: ゲツ、ガツ. Kun: つき.

An introduction to the Japanese writing system: Hiragana and Katakana. Learn the foundational scripts required to begin your journey toward N5 proficiency.

In this problem, we are asked to compare two numbers written in an unusual numeral system called the golden system.

HSK 5 | verb / noun | to reflect; to mirror; to convey feedback

黒 (koku/kuro): black. JLPT N5 kanji.

Mastering the full 学术语体 register for academic writing and scholarly discourse in Chinese.

社会 (しゃかい / shakai): society. N4 level Japanese vocabulary.

Describe symptoms, answer a doctor's questions, and understand medical instructions in Chinese.

HSK 5 | conjunction | introduces a concessive clause acknowledging a fact while contrasting it

Learn how to use 〜に違いない (ni chigainai) to express strong certainty and confident inference — 'must be; there's no doubt that; I'm sure that.' Includes structure, nuance, examples, and comparisons.

HSK 1 | verb, noun | to start, to begin, the beginning

HSK 5 | verb | to form; to come into being; to develop into

HSK 3 | noun | oil — cooking oil, fuel oil, or any oily substance

Ten structured N3 lessons for intermediate learners: news headlines, speech registers, causal expressions, opinions, conditionals, change expressions, workplace Japanese, reading strategies, natural speech, and paragraph writing.

HSK 3 | verb | to push, to shove, to promote or recommend

HSK 5 | verb / noun | to comment or critique; a commentary or review

中 (chuu/naka): inside. JLPT N5 kanji.

HSK 5 | discourse marker | in other words; to put it another way

HSK 1 | noun | one's elder sister

HSK 6 | noun/verb | an organizational framework; to design the structure of

Master large numbers, ordinals, fractions, decimals, multipliers (-obl-), distributives (-op-), and the preposition po.

A house of cards is built from floors. If a floor contains k rooms, then each room uses two leaning cards, so the rooms themselves consume 2k cards. Between adjacent rooms and above the outermost rooms there is a ceiling made of horizontal cards.

HSK 3 | verb + directional complement | to carry something out of an enclosed space, away from the speaker