Structure
Verb +(の(1))+ だろうか
[い]Adjective +(の(1))+ だろうか
[な]Adjective +(な + の(1))+ だろうか
Noun +(な + の(1))+ だろうか
(1) ん
Details
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Standard
使用域
一般
About ~のだろうか
When using だろう (the conjugated auxiliary verb) is grouped with か (the question particle), it presents the statement before it as something that the speaker is unsure about. In this way, it sounds similar to 'I wonder if (A)' in English.
To use this construction, the statement before だろうか must be nominalized (turned into a noun-phrase). This is done through the use of の, or なの (in the case of な-Adjectives and nouns).
To use this construction, the statement before だろうか must be nominalized (turned into a noun-phrase). This is done through the use of の, or なの (in the case of な-Adjectives and nouns).
- 私たちのチームは勝てるのだろうか。I wonder if our team can win.
- 彼女は本当に彼氏が欲しいのだろうか。I wonder if she actually wants a boyfriend.
- あの人は大丈夫なのだろうか。I wonder if that person is okay.
- あれは本当に食べ物なのだろうか。I wonder if that is really food.
- トムは私を誘うだろうか。I wonder if Tom will invite me. (の omitted)
- あの人は本当に弁護士だろうか。I wonder if that person is actually a lawyer. (なの omitted)
- そんな高い鉛筆をトムが買うのでしょうか。I wonder if Tom will buy a pencil that expensive.
- あの車はキムの車なのでしょうか。I wonder if that car belongs to Kim.
Caution
Although だろうか is quite masculine, it does not strictly mean that でしょうか is feminine. でしょうか may be used confidently by either women or men.Fun Fact
Like だろう, だろうか may be used to ask a question, or simply to express the speaker's inner thoughts.- この人が言っていることは本当なのだろうか。I wonder if what this person is saying is true. (Said while talking to oneself)
- そこに息子を連れて行っていいのだろうか?I wonder if I can take my son there. (Said while talking to oneself)
Synonyms
Examples
彼の都合が悪い(の)だろうか。
I wonder if it is bad timing for him?
もうすぐ時間だろうか。
I wonder if it is about time.
練習したら、うまくなる(の)だろうか。
I wonder if I will get better at it if I practice.
後で本当に家に行っていいのだろうか。
I wonder if it is really okay to go to his/her house later.
犯人が見つかる(の)だろうか。
I wonder if the criminal will be found.
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~のだろうか – Grammar Discussion
Most Recent Replies (6 in total)
Warrie
What is the difference between のだろうか and かな?
Fuga
Hey there @Warrie !
They both mean the same thing, but they are used in different situations. かな is used in more casual situations, like texting and casual conversations, while のだろうか is usually used in writing. のだろうか is also casual, but かな sounds more casual, if that makes sense!
Warrie
Makes sense, thank you! Maybe this info should be added to the explanations in BP. I had this question a couple of times with words with the same meaning and each time Google helped me out to explain the difference, in this case I just couldn’t find an answer.
Or for example when I give かな as the answer and then I get a ‘let’s try a different grammatical structure here’ reply, change that into ‘let’s make it slightly more formal’ or something like that?
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