Single words or sentences? What the sentence actually adds

Learn the word, but keep the sentence it came from. On its own a word gives you one thing: you will recognise it the next time you see it. The sentence it lived in gives you the rest, which is the particle the word demands, the words it habitually travels with, and the register that tells you whether you would actually say it out loud. That gap is the difference between a word you know and a word you can use, and it is why "just learn single words, it's faster" saves a few seconds now and quietly bills you for them later.

A word on its own gives you recognition, not use

A single-word card, with 会う on the front and "to meet" on the back, trains exactly one skill: seeing 会う and remembering it means meet. That is recognition, and it is worth having. You will read faster for it. But it is only half of what knowing a word turns out to mean. The other half is retrieval from nothing, when someone asks about your weekend and you have to build 友達に会った with no prompt in front of you at all.

Recognition does not carry you there. Reading a word and summoning it cold are two different skills, and the second is built by recalling the word, not by seeing it again. A bare word card only ever trains the first. The sentence is where the second one gets its raw material. Not because you memorise the sentence, but because everything you need to produce the word, everything about how it attaches to the rest of the clause, is in the sentence and nowhere else.

The sentence carries the particle the word demands

Ask a dictionary what 会う means and it says "to meet." What it cannot tell you, because it does not fit in a gloss, is that 会う takes に and not を. In Japanese you meet with a person: 友達に会う. Learn the word alone and nothing stops you saying 友達を会う, which is the single commonest way to get this verb wrong. You will keep getting it wrong, too, because the card never mentioned the particle in the first place.

A particle is not decoration on a verb. It is part of it, the way a preposition is part of an English phrasal verb: "look" and "look after" are not the same word, and neither are 会う on a card and 友達に会う in the wild. The sentence is the smallest unit that carries the particle, which makes the sentence the smallest thing actually worth learning. For the pictured 乗る, the transport-words lesson sets 電車に乗る beside 電車を降りる and 駅に着く, each with the noun and particle it needs.

Five common verb families make that particle evidence visible: compare 入る with 入れる, 出る with 出す, and 付く with 付ける without reducing each pair to an English gloss.

A purpose phrase changes the form you need to retrieve: 本を借りる means borrow a book, while 本を借りに行く means go to borrow one. The object remains 本を, but the purpose uses 借り before に. Keeping that whole phrase stops a dictionary-form card from hiding the stem.

The same applies to a construction such as ば～ほど, which links changing degrees. Knowing 読む means "read" does not explain why 読めば読むほど repeats it. The two forms together mean "the more you read," so a card needs enough of the sentence to preserve that relationship.

A route supplies another kind of frame: 店から駅まで identifies the shop as origin and the station as endpoint. Keeping both particles beside the place names preserves which direction you travelled; the two isolated nouns do not.

Time expressions need that context too. The eight time words in this N4 set distinguish waiting for a while, an arrival that is near, and deciding it is time to leave. Saving the surrounding sentence keeps those choices visible. It is also where you catch the relative time words that take no particle, since 今日 and 明日 drop に in exactly the place a bare card would hide it. For 最中に and たとたん, the surrounding action distinguishes an event during a task from a development at its boundary.

本を読むのが好きです keeps を with 本 and が with the reading activity. だけ also restricts activities.

予約だけでなく、相談も受け付ける adds consultations to reservations. Dropping でなく restores “reservations only.” 読むだけは読んだ keeps both verbs to preserve their roles.

A continuation can change the job: 説明を読むだけで使える makes reading sufficient, while 三つの案の中で二番目がいい bounds a judgment.

It carries the company the word keeps

Even with the right particle, words are picky about their companions. Some noun–verb pairings need to be learned together: 風邪をひく means catch a cold, and 約束を守る means keep a promise. The N2 noun–verb set contrasts 経験を積む with 失敗を重ねる: translating both through “accumulate” loses their usual partners. These familiar combinations do not prove that each noun permits only one verb. The accomplishment-verb comparison also includes 約束を果たす, carrying out what was promised.

Even びる, ぶる and じみる demand fixed combinations.

A single-word card leaves you to discover how 風邪 and ひく combine. The sentence arrives assembled. In business and news vocabulary, 商品を販売する identifies goods being sold, while 電力を消費する identifies power being used. The seven-verb comparison follows a shift within one headword: a ball making contact and a prediction proving right both use 当たる. At N1, four context-sensitive verbs separate interference, engagement, restraint and evidence through their particle frames. Repeated encounters turn these phrases into units you can retrieve whole.

For 必ずしも, たとえ, どうか and まさか, the useful partner may extend to the end of the clause. A price judgement with 必ずしも needs its negative qualification; an appeal with どうか needs the requested action or wish. Preserve that continuation alongside the headword. Several everyday adverbs of frequency behave the same way: あまり, めったに and ぜんぜん refuse to appear unless a negative is waiting at the end of the clause.

The three-word N1 argument set makes three attachments explicit: 厳密な modifies a noun, 支持する takes the supported proposal with を, and 適宜 modifies an action. Those fragments preserve distinctions that the isolated English glosses conceal.

Transitive or intransitive: the sentence settles which you learned

Japanese is full of verb pairs that look alike and split one job between them. One verb reports a change to a thing; the other describes someone acting on it. 開く and 開ける both live under the English word "open." A door opens with 開く; someone opens it with 開ける. Learn either one from a card glossed only "open" and you have no way of knowing which half of the pair you are holding.

The sentence settles it in a single stroke, because the two verbs take different particles and the particle is sitting right there. ドアが開く has が and does not name a cause; ドアを開ける has を and presents an opening action. This is the same fact as the particle section, seen from the far side, and that is the whole point. The grammar a word needs is not a separate subject you study after the vocabulary. It is fastened to the word, and the sentence is where it stays fastened.

The same viewpoint split controls five Japanese verbs for change: 予定が変わる reports that a plan changed, while 予定を変える puts the plan in someone's hands.

The N4 lesson on transitive and intransitive pairs follows three more changes and shows why an event sentence can remain true even when a person caused it.

It tells you the register, whether you'd say it out loud

With kango and wago in purchase, hiring and discussion, preserve the object before comparing tone. 採用 can adopt a method as well as hire a person; 雇用 concerns paid person-employment in that comparison. A shared English verb does not settle the Japanese choice.

A word also carries a register, and the citation form on a flashcard strips it clean off. 食べる and 召し上がる both mean "eat." One you say to a friend; the other you say about your guest, and choosing wrong is not a small slip. Some words are almost only ever written and land stiffly when spoken; some are casual to the edge of rude in the wrong room. None of that fits on the back of a one-word card, and a learner working from bare glosses tends to produce a flat, register-less Japanese where every word is the dictionary one. That is a real part of why textbook Japanese sounds stiff: it teaches the safe citation form and leaves the register behind.

The sentence keeps the register attached because a real sentence comes from a real situation. You saw 召し上がる on a menu, or heard it from a waiter, and that situation is the register. The context is exactly what you throw away when you copy the headword onto a card and drop the rest. With ものの and とはいえ, two forms of written concession, keep both sides of the contrast: the first clause alone cannot tell you what the writer is qualifying. With ながらも, save the granted fact together with the unexpected continuation, such as knowing a rule yet disregarding it.

For ても and のに, retain the outcome too: a condition that changes nothing and a fact that defies an expectation can share an English translation. With にかかわらず and を問わず, keep the stated permission beside the category: 年齢を問わず can remove an age barrier while a separate reservation rule remains.

With に過ぎない and にほかならない, even the same noun can carry a different evaluation: 言い換え may be merely a rephrasing or emphatically identified as rephrasing. Keep the ending and the surrounding claim; the English gloss “nothing but” does not settle that difference.

You don't memorise the sentence, you anchor the word to it

The objection to all of this is that sentences are more to remember, and drilling whole sentences sounds slow. But you are not memorising the sentence. The card still tests one word. The sentence sits underneath it as the context that supplies the particle, the company and the register, and as a second, richer cue when you go to recall it. A word floating alone has one hook into memory, its meaning. The same word inside 友達に会った has several: the friend, the past tense, the situation you were in when you met it. More hooks means more ways back to the word when you need it.

A time clause can make the same past form point toward a future action. In 読む前に and 読んだ後で, the reference event decides which form you need. Retaining 明日 in an after-clause example keeps 読んだ from being mistaken for a claim about yesterday.

For that past-tense cue, the N5 た-form lesson explains why 会う becomes 会った, and how polite 会いました reports the same event in a different register.

It is also why a sentence you met yourself beats one lifted from a textbook. A word you actually ran into arrives with a moment attached, where you were and what you were reading, and that moment is a retrieval cue no stranger's example sentence can hand you. The sentence is not extra work bolted onto the word. It is the part of the encounter you would otherwise be discarding.

This is the part Kikusho is built around. When you capture a word, from a photo, your voice, or pasted text, the card comes back with an example sentence already on it, taken from where the word was used. The sentence arrives with the word instead of being something you have to construct and staple on afterwards, and you can play its audio or turn any word in it into a new card by selecting it.

Won't I only be able to use the word in that one sentence?

This is the fair worry: anchor 会う to 友達に会う and maybe all you have learned is that one phrase. In practice the opposite happens, because what the sentence taught you is the frame, not the furniture. The particle, the transitivity, the register carry over unchanged to the next friend, the next appointment, the next person you go to meet. What is specific to the sentence, the friend and the past tense, is exactly the part you drop without thinking, because it was never the word.

You confirm the frame the second time you meet the word, in a different sentence, and the two encounters generalise each other. That is an argument for keeping the sentences, not for stripping them: two sentences with 会う, both showing に, teach the particle far more firmly than seeing 会う twice on a bare card ever could. The word is what stays constant across the sentences; the sentences are what show you the shape of the space it moves in.

When a single word is genuinely enough

None of this means every word needs a sentence. A concrete noun is usually just itself. 椅子（いす） is a chair, 駅 is a station, and there is no particle drama, no register question, nothing a sentence would add that the picture in your head does not already supply. Even a concrete label earns a phrase when its boundary or role is easy to miss: the N4 body-word set keeps 指 with fingers and toes, and shows how が, を and で change with the predicate. Place names, numbers, most nouns you can point at: a bare card is fine, and pretending otherwise only slows you down.

The sentence earns its place for the words that actually do something in a clause. Verbs, adjectives that take a particular particle, anything whose politeness is not obvious, anything you would only ever use in combination with something else — the way a degree adverb like 全然 is ungrammatical without a negative verb after it. A high degree also changes shape depending on whether あまりにも judges it directly or ほど measures it through a result. If you are unsure which kind of word you are holding, that uncertainty is itself the answer. Keep the sentence, because a word you are not sure how to use is precisely the word whose sentence you will be glad you kept.