Structure
おそらく + Phrase
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Formal
About おそらく
恐らく is an adverb which originally stems from the conjugation of the yodan verb, 恐る 'to fear'. In most cases, 恐らく is simply used as a formal way to say 'probably', or 'perhaps', and is usually partnered with other structures of conjecture such as だろう, かもしれない, etc.
As 恐らく behaves adverbially, it will most often appear at the beginning of sentences before a statement of conjecture is made.
Although 恐らく can, and often does, carry the meaning of 'I fear that (A)', it isn't necessarily always used in relation to negative things. In the case of this particular grammar pattern, the main nuance that 'I fear that (A)' conveys is modesty on behalf of the speaker in that they fear their assumption may be right, given the available information.
Fun-fact
Yodan, or 四段活用 verbs are a type of classical-Japanese verb that have primarily been replaced by godan (う-Verbs) in modern day Japanese.
Synonyms
Examples
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恐らく彼はここにいないだろう。
He most likely isn't here.
恐らく明日雨が降る。
Perhaps it will rain tomorrow. (I fear that...)
彼だったら、恐らくこんなことできっこないでしょう。
If it's him, he most likely won't be able to do it. (I fear that...)
私の兄は恐らく11月頃アメリカから帰るかもしれない。
My older brother will probably return (home) from the US around November.
「くそ、恐らくあなたの結婚式には行けないじゃないか。」
'Dang it, I think I probably won't be able to go to your wedding.' (I fear that...)
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