N2 Grammar Decision Guides
Confusable pattern clusters · decision flowcharts · side-by-side contrasts
Most N2 grammar lists give you 170 isolated definitions. The hard part is not knowing what 〜ざるを得ない means — it is choosing between it and 〜ないわけにはいかない under exam pressure. These guides group patterns that compete with each other and give you a procedure for telling them apart.
The わけ Family: わけだ vs わけではない vs わけにはいかない vs わけがない
All four come from わけ (訳) meaning "reason / the logic of a matter". Once you see the shared root, the four split cleanly: stating a logical conclusion, partially denying an assumed inference, refusing on principle, and denying possibility outright.
Open guideObligation & Inevitability: ざるを得ない vs ないわけにはいかない vs べきだ
English collapses this cluster into "have to / should / can't help but". Japanese splits it by the *source* of the pressure: outside circumstances, personal principle, general truth, subjective judgement, or uncontrollable emotion.
Open guideConditionals: としたら vs 以上は vs たところで vs ものなら
The trap here is trying to judge "settled fact vs hypothetical" from verb tense — that fails. Use the もし insertion test instead: if you can naturally prepend もし, it is a genuine hypothetical.
Open guideCause & Reason: おかげで vs せいで vs ばかりに vs ことから vs ことだから
Japanese encodes into the grammar itself what English leaves to tone: whether the outcome was good or bad, whether the cause was trivial, and whether you are inferring from evidence or from knowing someone's character.
Open guideConcession & Contrast: にしては vs にしても vs くせに vs ながらも vs つつも
Nine patterns that all become "although / even though" in English. Japanese separates them by whether you are comparing against an expectation, conceding a condition, or adding an emotional charge.
Open guideEmphasis & Addition: さえ vs すら vs ばかりか vs はおろか
The key split is between plain addition (ばかりか: "not only A but also B") and a difficulty chain (はおろか: "forget A — he can't even do B", where B is the easier thing).
Open guideDegree & Limitation: のみならず vs はもとより vs どころか vs ないまでも
Three of these escalate in the same direction; どころか is the only one that reverses. ないまでも is a different animal entirely — it lowers the bar rather than raising it.
Open guideTime Relations: とたんに vs なり vs が早いか vs そばから vs 次第
Five patterns all mean "as soon as". They differ in register, in how tightly the two events overlap, and — for そばから — in whether the pattern repeats.
Open guideConjecture & Appearance: げ vs っぽい vs 気味, に違いない vs に決まっている
The げ / っぽい / 気味 trio is best decided by grammatical behaviour, not by meaning — each attaches differently and has a very different vocabulary range.
Open guideRelation, Standard & Standpoint: を問わず vs にかかわらず, にとって vs にしたら
Sixteen patterns in four sub-groups: irrelevance, basis, viewpoint, and medium. Most confusion happens inside a group, so learn the groups first and the contrasts second.
Open guidePurpose: べく vs んがために, and the べき family
A small category, but the べく / べきだ / べからず trio share a root and are easy to misread. べく is adverbial purpose, べきだ is predicate obligation, べからず is classical prohibition.
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