I was almost towards the end of my bedtime news article when I got stumped by this sentence:


To Japanese learners past the beginner level, it is known that [辞書形]+ことがある roughly translates to "there are times that~" or "sometimes, ~". Somehow, translating this sentence somehow using that translation doesn't make sense to me. It appears to me that the sentence translate to:

"If you know where you got bitten, you may know what bug was the cause (of the bite) [or "you may know what bug bit you"], so please inform (tell) them."

Something seems to be off in this sentence. (I can't tell why though.) Or should it be translated to

"If they know where you got bitten, they may know what bug was the cause (of the bite) [or "they may know what bug bit you"], so please inform (tell) them."

Is this an example of a sentence with two clauses where the implied subject changes halfway through? And speaking of implied subject, how can one tell in just one reading that the subject has changed midsentence? Or do even native speakers of Japanese have to read a sentence twice just to realize that the subject has changed?

1 Answer 1


The grammatical subject that corresponds to わかる is actually very explicit; the subject is not "you" nor "they" but どんな虫が原因か, which is an embedded question. 分かる here means "to become known; to turn out" (see the second definition here). For example, 犯人が分かりました means "I found out who the criminal is" rather than "The criminal understood it". This part can be written also as どんな虫が原因かわかる, but を/が after an embedded question is often omitted.

In the ~が分かる construction, who noticed the fact is not explicitly stated, and it may or may not be inferred from the context. For example, you can say ドアは閉じていたことが分かった ("It turned out that the door was closed") without saying who noticed this fact. In your context, it is obviously the physician who may notice the responsible bug. Therefore, a literal translation is "what bug is the cause sometimes becomes clear", but you can rephrase it like "a physician may notice which bug is the cause".

  • Thank you! I remember just now that わかる is intransitive even though it sometimes get translated to "to know" which is a transitive verb in English. (But I will keep in mind the dictionary definition of "to be known" instead of "to know, to understand") Anyway, just a simple follow-up question: so if I want to make it even more obvious, I can write it as"(医者は、)どこでかまれたのかわかると、どんな虫が原因かわかることがあるので(医者に)伝えてください", right? Is this a grammatically correct sentence?
    – rebuuilt
    Jul 3, 2020 at 23:30
  • 1
    Yes, that's perfectly fine, but adding both 医者は and 医者に would be a bit redundant.
    – naruto
    Jul 4, 2020 at 1:41
  • and 日本語らしくない. Thanks again
    – rebuuilt
    Jul 4, 2020 at 9:08

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