brain

HSK 4 | n/v | the state of not succeeding; to not succeed

HSK 1 | adjective | busy, occupied

HSK 6 | n | the highest form of human intelligence — the capacity to use knowledge and experience with sound judgment

Esperanto vocabulary for travel, transportation, directions, accommodation, and tourism.

HSK 3 | verb / noun | a firm commitment that something will happen

HSK 4 | noun / verb | an activity, event, or campaign; to move around

HSK 4 | noun/verb | an immune reaction to a normally harmless substance

やっと (やっと / yatto): finally, at last. N4 level Japanese vocabulary.

HSK 3 | preposition | marks passive voice, indicating the subject is acted upon

Learn how Esperanto's unlimited compounding system works to create precise, expressive vocabulary from simple roots.

HSK 3 | adverb | used with negation to mean 'never' or 'not once'

Master all four Japanese conditional forms — 〜たら, 〜ば, 〜なら, 〜と — with a comprehensive 4×4 comparison grid, learner error analysis, and contexts where substitution between them is impossible.

We are given a grid where some cells are marked X. These are the cells that were painted at least once. Originally, a rectangular brush of size h × w was placed somewhere on the grid. After that, the brush was moved several times.

HSK 4 | noun | the general direction in which something is developing

HSK 2 | adjective | morally bad, of poor quality, or physically broken/spoiled

HSK 5 | verb | to investigate deeply; to explore and inquire into the nature of something

決める (きめる / kimeru): to decide. N4 level Japanese vocabulary.

HSK 2 | adjective | describes something that saves time or effort

HSK 4 | adjective | having the pleasant taste of sugar; also used figuratively

HSK 5 | adjective | legal, lawful, legitimate

HSK 3 | adjective | remaining rational and unruffled in difficult situations

HSK 5 | verb | to cultivate, to nurture, to develop, to train

HSK 6 | verb | to set forth in detail, to expound on a topic systematically

The C1 Chinese argumentative essay — 议论文 structure, evidence types, transitional logic, and the art of rhetorical elevation

HSK 6 | n/v | a proposition or thesis; the act of setting an examination question or essay topic

HSK 1 | noun | the period from noon to around 6 p.m.

Express intentions and future plans using 打算, 准备, 要, and 会 in natural Chinese.

HSK 1 | phrase | negates identity or equation using the verb 是

Essential Japanese vocabulary for trains, buses, taxis, traffic, directions. N1 level reference with readings, romaji, and examples.

HSK 4 | verb/noun | to exchange views on a topic in order to reach understanding or agreement

HSK 4 | noun / adjective | science; or being scientific and systematic

HSK 1 | noun | doctor, physician

How to compose Sindarin poetry: the attested linnod verse form (7+7 syllables), scansion of A Elbereth Gilthoniel, alliteration rules, and step-by-step composition exercises.

HSK 4 | noun | a person with specialized professional expertise

HSK 5 | noun | reputation, prestige, good name

HSK 4 | verb / noun | offering analysis or opinion on something

The inverted pyramid, news leads, and the register conventions of Chinese journalism — reading and producing newswriting at C1 level

HSK 5 | noun | an official plan or course of action adopted by a government or organization

HSK 4 | verb | to refuse to admit or acknowledge something

HSK 5 | noun | a branch of AI in which systems learn from data to improve performance

HSK 5 | noun | pressure, stress, burden

HSK 1 | noun | friend

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

HSK 1 | number | the digit zero; also used between digits in spoken numbers

HSK 5 | verb / noun | to manufacture; to fabricate; to produce

HSK 3 | noun | quality, standard — how good or poor something is

車 (car, vehicle): 7 strokes, JLPT N5. On: シャ. Kun: くるま.

HSK 4 | verb / noun | standing in for or symbolizing someone or something

HSK 5 | verb | to plan carefully and strategically; to devise a scheme

HSK 5 | adjective | fair and just; treating everyone equally

HSK 1 | conjunction | introduces a conditional clause

HSK 1 | verb phrase | to sleep, to go to sleep

HSK 4 | noun | a place or system where goods and services are exchanged

HSK 5 | verb/noun | to communicate; mutual exchange of information or feelings

Consolidation of all C1 patterns, high-frequency vocabulary review, and a comprehensive self-assessment framework for HSK 6 readiness

HSK 1 | noun | the period from dusk to bedtime

HSK 3 | verb | to support, to back, to endorse

HSK 3 | noun | steamed stuffed bun, a classic Chinese food

九 (nine): 2 strokes, JLPT N5. On: キュウ、ク. Kun: ここの、ここの-つ.

HSK 2 | verb/complement | result complement: action is completed/finished

Complete guide to keigo (敬語): teineigo (polite), sonkeigo (respectful), and kenjougo (humble) — with conjugation rules, common verbs, and example sentences.

HSK 4 | adjective | formal, official, or done according to proper procedure

HSK 1 | noun | woman, female adult

HSK 5 | verb/noun | to become extinct; total elimination of a species or group

HSK 5 | verb / noun | to inspire, to enlighten; inspiration, enlightenment

HSK 5 | noun phrase | mental health; psychological well-being

HSK 5 | verb / noun | to appeal, to call for, to urge; an appeal, a call

HSK 1 | verb | the linking verb 'to be'; NOT used for possession

HSK 5 | noun | immersive computer-simulated environment

HSK 3 | adjective | describing something as interesting, fun, or engaging

HSK 3 | adjective / noun | pride (positive: proud of someone); arrogance (negative: conceited)

HSK 5 | noun | brand, brand name

We are asked to build a staircase-like structure made from two types of blocks, red and green. The structure has some number of levels, and the levels form a strict decreasing sequence in size: if the top level has size n, then the next has n-1, then n-2, and so on down to 1.

HSK 4 | verb | to cope with; to deal with; to respond

HSK 4 | noun | something that requires thought, attention, or resolution

Apply all intermediate constructions to Caesar's De Bello Gallico, with a full analysis of BG 1.1.

HSK 2 | noun | money, currency, or a sum of money

Build the core vocabulary and discourse structures needed to engage with academic texts, arguments, and analytical writing in Chinese.

N1 grammar pattern 〜ずにはすまない: expressing that social norms, morality, or the situation demands that X be done — one cannot get by without doing X.

HSK 4 | verb | to maintain or protect something

HSK 4 | verb | to agree, to consent, to approve

HSK 3 | verb / preposition | to pass through or by; after going through a process

HSK 5 | adjective | resistant to change; preferring traditional values

HSK 1 | adjective | pleasant to look at, applies broadly to people and things

We are given k permutations of the numbers from 1 to n. A permutation is simply a rearrangement of these numbers. Our goal is to find the length of the longest sequence of numbers that appears in the same relative order in all k permutations.

昨 (saku/): yesterday. JLPT N5 kanji.

A systematic guide to Esperanto's authoritative dictionaries, the etymology of its root stock, neologism adoption, and confusable word pairs at advanced level.

HSK 4 | noun | a formal gathering for discussion or decision-making

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

HSK 2 | adverb/adjective | really, truly, genuinely; real, authentic

HSK 3 | adjective / verb | convenient, to be convenient, to make things easy

HSK 5 | noun / adjective | judiciary, the judicial system, administration of justice

HSK 4 | verb | the process by which something comes into being

HSK 4 | noun/verb | professor; to teach, to instruct

The grammar and vocabulary of Chinese legal discourse — statutory language, contract clauses, and the register of rights, obligations, and liability

We are given a sequence of integers a1, a2, ..., an with values between 1 and 30, and we need to construct another sequence b1, b2, ..., bn of positive integers such that every pair in b is coprime.

HSK 4 | noun | science and technology as a combined field

HSK 5 | noun/adjective | freedom, liberty; free, unrestricted

HSK 3 | noun | weekend, Saturday and Sunday