JLPT N4's Four Hardest Grammar Hurdles
The hardest JLPT N4 grammar points are not new words to memorize. They are new choices the language forces, and four of them stall almost every learner who has just cleared N5. Each one is a place where a single English category splits into several Japanese forms, or where Japanese marks a meaning that English leaves unspoken.
Overview
This is a triage and strategy guide, not a full re-teaching of each form. It names the four hurdles where N5 graduates stall, explains why each is hard for an English speaker, and gives an order and approach for attacking them. The full form-by-form teaching lives in the canonical grammar articles, which each hurdle points to.
The four hurdles are transitivity pairs (自他動詞), the four conditionals (と・ば・たら・なら), the passive and causative (受身・使役), and te-form aspectual expansions, which are auxiliaries such as てしまう・ておく・てある that add completion, preparation, or resultant-state meaning.
Why N4 Grammar Feels Like a Wall
N5 grammar is largely additive. You build sentences by stacking forms whose meanings map fairly cleanly onto English: です, basic te-form linking, and the plain past. The difficulty is "learn one more form."
N4 is the first level where the difficulty shifts. The task is no longer just to learn a new form. You also have to choose between forms that English does not distinguish, and track meanings carried by auxiliaries rather than by the main vocabulary. That shift is the wall.
The four hurdles below all share that pattern. Each is a place where one English category splits into several Japanese forms, or where Japanese encodes a meaning English leaves unmarked.
- Transitivity pairs: English often uses one verb where Japanese keeps two morphologically distinct verbs, and the particle (が vs を) flips with the choice.12
- The four conditionals: one English "if" maps to four Japanese forms with different conditions for when each is allowed.3
- Passive and causative: heavy conjugation, a perspective the speaker must track, an adversative passive with no English equivalent, and the られる form doing several jobs.4
- Te-form aspectual expansions: the nuance, such as completion and regret, advance preparation, or a resultant state with an implied agent, is carried by the auxiliary, not by any word an English speaker would normally translate.56
These four are the points where an N5 graduate stalls, not the complete N4 grammar list. They are conventionally introduced at the N4 stage in standard graded curricula.3
How to use this guide
Read each hurdle for two things: why it trips learners and how to attack it. Where the strategy is general teaching guidance, it is framed as J-Compass synthesis; the underlying linguistic facts carry citations.
For the order in which to take the four hurdles, see "The order to tackle them" under "Good to know" below. The short version is to do the form-choice hurdles (transitivity, conditionals) before the conjugation-heavy ones (passive, causative), and the te-form auxiliaries last.
Hurdle 1: Transitivity Pairs (自他動詞)
Many Japanese verbs come in morphologically related pairs that share a root but differ in transitivity: 自動詞 (jidōshi, intransitive, literally "self-move verb") and 他動詞 (tadōshi, transitive, literally "other-move verb").1 WATP (NINJAL) defines a transitivity pair as two verbs that share lexico-semantic composition, meaning roughly the same event structure, but encode the alternation differently in their morphology.1
Why it trips learners
English gives no reliable intuition here. English usually uses one verb form for both members of a pair, so "the door opens" and "I open the door" both use open. Japanese forces a choice between two distinct verbs, with no English cue to lean on.2
The particle flips with the choice. The intransitive member takes a subject marked が; the transitive member takes a direct object marked を.12 Picking the wrong verb therefore also breaks the particle, so one mistake becomes two.
A standard example is 開く (aku, intransitive, が) "to open" versus 開ける (akeru, transitive, を) "to open."1
The pairing is not predictable from a single rule. Jacobsen documents that the direction of derivation and the morphological shape vary across pairs. There is no single affix, or word ending, that reliably marks transitive versus intransitive across the whole set.2 This is why the standard approach is to memorize pairs as pairs rather than derive one member from the other.
Some ending-pattern families do recur, but as tendencies rather than exceptionless rules. These include the -aru (intransitive) and -eru (transitive) family, such as 始まる (hajimaru) and 始める (hajimeru) "to begin"; and the -eru (intransitive) and -su (transitive) family, such as 消える (kieru) and 消す (kesu) "to go out / to turn off."2
How to attack it
Study each verb as a pair, not as a singleton. Drill the particle alongside the verb so が-with-intransitive and を-with-transitive are learned as one unit.12 Group new pairs by ending-pattern family to lighten the memory load, while still expecting exceptions.2
Lean on a curated reference list of pairs rather than trying to derive members on the fly. The canonical transitivity articles, including the 50-pair reference list, are the place to drill from.
Hurdle 2: The Four Conditionals (と・ば・たら・なら)
English has effectively one conditional "if." Standard Japanese has four productive conditional forms, と, ば, たら, and なら, each with distinct conditions for when it can be used.3
Why it trips learners
You cannot pick the form by translating "if." The choice depends on the type of relationship, such as automatic versus hypothetical, the time sequence, and whether the antecedent is already given or being treated as a topic.3
The four forms also overlap in their English glosses: "if," "when," "whenever," and "in case." That is why a one-to-one mapping fails and learners stall on the boundary cases.3
Each form has its own licensing condition:
| Form | Core meaning | Defining restriction |
|---|---|---|
| と | natural, automatic, or inevitable consequence | main clause cannot express will, command, request, invitation, or permission3 |
| ば | general hypothetical or provisional "if"; at home in generalizations and proverbs | carries provisional / hypothetical force3 |
| たら | broadest and most colloquial; "if" or temporal "when / after" | fewest restrictions; the antecedent clause must precede the consequent3 |
| なら | supposition / topic conditional; "if it is the case that / speaking of X" | picks up given information; cannot express an automatic factual result3 |
Two boundary cases cause most of the stall. と and たら share a non-conditional sequence use ("and then / when") where neither means "if," which is a known source of confusion.3 なら also differs from the other three: its antecedent is a supposition about a topic rather than a real or temporal condition. That is why it resists the automatic-result reading that と requires.3
Both と and たら have a sequence use ("and then," "when") in which neither expresses a condition. Reading every と or たら as "if" is the boundary mistake that recognition-level study hides.3
How to attack it
Anchor your study in the overview decision guide, and learn one form at a time rather than all four at once. Treat たら as the workhorse first, because it is the least restricted. Then layer in the boundaries: the と restriction against a volitional main clause, the なら topic and supposition restriction, and the と / たら sequence use that is not "if" at all.3
Drill the boundary cases specifically. The recognition-level intuition that "they all mean if" does not survive production practice. The canonical conditionals overview, the per-form articles, and the sequence-use article are the drilling targets.
Hurdle 3: Passive and Causative Forms (受身・使役)
The passive and causative add heavy conjugation to meanings that the speaker must consciously track. They are the hurdle where morphology and perspective both get harder at once.4
Why it trips learners
The conjugation load comes first. The passive adds ～(ら)れる and the causative adds ～(さ)せる to the verb, on top of the godan and ichidan conjugation you already track. The causative-passive then stacks both into ～(さ)せられる.4
The られる form is overloaded. The same ～(ら)れる serves the passive, the potential ("can"), the spontaneous or involuntary, and the subject-honorific, which politely raises the status of the subject. Because one surface form carries four functions, context, not morphology, has to tell them apart.4
The passive also reorganizes the sentence. The affected party becomes the topic or subject, and the original agent is marked with に. This means the speaker has to track a perspective flip that the active sentence did not require.4
The honorific use of ～られる is the same surface form as the passive, the potential, and the spontaneous. Only context separates them, which is what makes the form hard to parse in reading and harder to produce on purpose.4
The hardest piece is entirely alien to English. The indirect, or adversative, passive puts an intransitive verb into the passive to say the subject was adversely affected by an event, such as being rained on. English has no clean construction for "I was negatively affected by the rain falling," so the category has to be learned as a new concept rather than mapped from English.4
The form-level facts are compact. The passive is V + ～(ら)れる, with the agent marked に. The causative is V + ～(さ)せる, "make or let someone do." The causee is marked を for the coercive "make" or に for the permissive "let," so the に / を contrast carries the make-versus-let nuance.4 The causative-passive is V + ～(さ)せられる, "was made to do." It typically reads as unwanted or imposed, with the forcer marked に; it is a later compound, not a core N4 hurdle.4
How to attack it
Separate the conjugation drill from the meaning drill. First make the ～(ら)れる and ～(さ)せる forms automatic on any verb. Only then work on the meaning layer: the perspective shift, the に agent-marking, the に / を make-or-let contrast, and the adversative passive as its own concept.4
Learn the passive and the causative apart before combining them, and treat the causative-passive ～させられる as a later compound built on solid versions of both.4 The canonical passive, causative, and causative-passive articles are the deep dives. The honorific use of ～られる has its own home in the sonkeigo article.
Hurdle 4: Te-Form Aspectual Expansions (てしまう・ておく・てある)
The te-form itself is mechanical once you learn the construction rules. The difficulty is that each auxiliary attached to it adds an aspectual or attitudinal nuance, such as how complete the action is or how the speaker feels about it. English does not mark that nuance with any single word, so a learner who translates only the main verb still misses what the sentence is doing.5
Why it trips learners
てしまう grammaticizes from しまう "to put away / to finish." Ono documents shimau as a marker of the frustrative, the perfect (completion), and non-volitional or evidential meaning.5 In practice, learners often meet it as a completion-plus-regret reading: the action is finished, often with an unintended or regrettable flavor. The regret is the part learners miss, because nothing in the English translation forces it.
ておく grammaticizes from おく "to put down / to keep." Ono documents oku as a marker of the preparative or purpose, the perfect, and the volitional.5 In practice, this is the "do something in advance and leave it in place" reading: a deliberate, forward-looking preparatory action that is invisible if the learner reads only the main verb.
てある is the subtle one. It expresses a resultant state produced by an intentional prior action, and it is the canonical contrast partner of ている. With achievement verbs, which describe a change that reaches a natural endpoint, ている readily yields a resultative ("is in the resulting state") reading rather than a progressive one,6 and てある overlaps that space while adding the implication that an agent did the action on purpose.
Both can describe a resulting state. ている is the broad imperfective whose resultative reading is favored by achievement verbs,6 while てある adds the implication of a deliberate prior agent. Drilling the two side by side is the only reliable way to separate "is in a resulting state" from "has been set in that state on purpose."
At the form level, てしまう carries completion, regret, or unintendedness, and contracts casually to ちゃう (from てしまう) and じゃう (from でしまう).5 ておく carries advance preparation and a deliberate, volitional sense.5 てある and ている both describe a resulting state. てある adds the deliberate-agent implication, and it is taught in its canonical home against ている.6
How to attack it
The prerequisite is solid te-form construction. Without it, all three auxiliaries collapse. Lock the te-form first. Then learn one auxiliary at a time and attach its nuance explicitly: completion and regret for てしまう, advance preparation for ておく.5 Finally, drill てある against ている side by side, because that contrast is the genuinely subtle one.56
Treat the nuance as the learning target, not the conjugation. The conjugation is trivial; the meaning is the whole point. The canonical ～てしまう and ～ておく articles, the ている-versus-てある article, and the two te-form prerequisite articles are the deep dives.
Good to know
The order to tackle them
Take transitivity pairs and the four conditionals first. Take the passive and causative second, and the te-form aspectual auxiliaries last, with the te-form prerequisite handled before any of the Hurdle 4 auxiliaries.
The reasoning is cumulative. Transitivity and conditionals are about choosing the right form, which builds the habit of noticing that Japanese makes distinctions English does not. The harder hurdles also demand that habit. The passive and causative add conjugation load and perspective on top. The Hurdle 4 auxiliaries depend on a solid te-form and on the resultative intuition the earlier work establishes. This sequencing is editorial guidance, not a cited finding.
Don't skip the te-form prerequisite
Attempting てしまう, ておく, or てある before te-form construction is automatic is a sequencing trap. The auxiliary nuances cannot be learned while the base form is still effortful. The te-form also underlies the compound-predicate practice that supports the passive and causative drills.5
The fix is to make te-form construction automatic before reaching for any Hurdle 4 auxiliary. The aspectual auxiliaries attach to the te-form, so a shaky te-form weakens everything built on it.
These are points to drill, not just read
Treating these four as reading material rather than production targets is the deeper mistake. Each hurdle is a place where you may recognize the form but still fail to produce the right choice under time pressure: the right pair member and particle, the right conditional for the licensing conditions, the right voice and agent-marking, or the right auxiliary nuance.
The recognition-versus-production gap is exactly why a flat must-know list does not move the needle. The fix is output practice, not rereading rules: drill pairs, boundary cases, conjugation-then-meaning, and one auxiliary at a time.
See also
- JLPT N4 Prep Overview: What's on the Test
- JLPT N4 Grammar Checklist: The Curated List
- A 6-Month JLPT N4 Study Plan
- The ば Conditional: The Hypothetical "If"
- JLPT N4 Vocabulary List: ~700 New Words Beyond N5, by Category
- The JLPT Explained: Levels, Sections, and What Each Means