# Japanese notes 4 | Reasons, intent, and information sources: んです, から, つもり, そう

Editor’s analysis

熱があります reports a situation; 熱があるんです treats the fever as background that needs explaining, for example why you feel unwell or are taking time off. どうしたんですか asks the other person to explain something unusual you’ve noticed.

For nouns and na-adjectives, the non-past affirmative is なんです: 風邪なんです／静かなんです. In the past and the negative, the corresponding plain form stays: 風邪だったんです／静かではないんです.

An early chat once listed 静かなんです as both correct and incorrect at the same time, which was a labeling error; the form itself is correct. This edition does not carry that × over.

Editor’s analysis

The source handbook already corrected から to allow both plain and polite style; this edition fills in the equally important ので as well: 行くので／行きますので, 休みなので／休みですので are all acceptable.

から tends to present the preceding clause more directly as a reason; ので often reads more like an explanation of the situation. But “subjective vs. objective” is only a rough summary of the nuance, not a test of right and wrong. ので can also introduce a polite request, so a following clause containing “ください” is not automatically wrong.

Keep the causal ため（に） and the purposive ために apart: 台風のため is a cause; 健康のために usually expresses a purpose or benefit. Work out how the events relate first, then look at the form.

Editor’s analysis

のに often carries a sense of contrary expectation, as in “it really shouldn’t be this way”; けど／が can express a more general contrast, and can also link topics or soften a request. ものの acknowledges the first clause, then points to a reality that didn’t turn out as expected; にもかかわらず is more typical of formal concessive statements.

This is not a fixed ranking of emotional intensity: のに doesn’t always signal anger, and ものの can’t replace のに in just any sentence. This edition keeps the source handbook’s notes on register tendencies without turning them into absolute bans.

Editor’s analysis

AとB lists nouns; VたりVたりする gives representative activities; AしBし can line up facts, features, or reasons. In the handwritten notes, Aもあるし、Bもある combines も for addition and し for listing; it is not a new verb conjugation.

たり is formed from the ta-form, but the tense still depends on the final する／しました. し can also follow polite forms, as in ありますし. Both show once again that “seeing た means past” and “inside a sentence means plain form only” are unreliable.

Editor’s analysis

わけではない usually negates a generalization or inference; わけがない strongly denies a possibility; わけにはいかない says that factors such as responsibility or one’s position make the action inappropriate. Don’t memorize all three as simply “can’t.”

行かないわけにはいかない means “you can’t choose not to go,” which leads to “you must go.” Where the negation attaches matters more than how the whole sentence gets translated.

Editor’s analysis

行くと思います uses と to introduce the content of a thought; 行くと言いました uses it to introduce what was said. Direct quotation can keep the original です／ます／ください; indirect reporting usually recasts the content in the plain form first.

ように言う doesn’t quote just any fact; it relays a request or instruction. Watch who says it, to whom, and who is supposed to act: 先生は私に早く来るように言いました — here, the person receiving the request is “私.”

Editor’s analysis

予定 states that such an arrangement exists, without directly saying whether it comes from your own will; つもり highlights intention; ことにする focuses on your own decision; ことになる focuses on an outcome brought about by outside arrangements or circumstances.

Treating 予定 = “the plane ticket is already bought” as a memory aid is fine, but it doesn’t guarantee the meaning. Likewise, つもり is not the most natural choice for every spur-of-the-moment decision. The source’s metaphor of “a decision in your head / an itinerary” is kept in this edition only as an aid to understanding, not as a necessary condition.

Editor’s analysis

かもしれない raises a possibility; でしょう makes a guess, and can also be the “right?” that checks shared knowledge. はず emphasizes a reasonable expectation based on rules, schedules, or known conditions; に違いない emphasizes strong conviction.

Even when they all come out as “should,” the reasoning behind them can differ. There is no fixed percentage set by grammar, and the speaker’s confidence shouldn’t be mistaken for the actual probability that something will happen.

Editor’s analysis

降るそうです reports something you heard, while 降りそうです is a judgment based on signs; change a single conjugation and the information source has already changed. そうなんですか acknowledges what the other person said; it is not a new pattern for guessing the weather.

らしい in these notes covers inference from indirect information or signs; nouns and na-adjectives in the non-past affirmative usually attach to it directly, without だ. Nらしい can also have a “typical of N” use, but that isn’t the original focus of these notes, so it isn’t mixed into the same rule here.