Japanese のだろう grammar nodarou

Let’s learn Japanese のだろう grammar nodarou :

Japanese のだろう grammar nodarou

Formation :

N／Aな＋のだろう
Aい／Vのだろう

Meaning and how to use :

1. Describe the judgement or speculation of the speaker that relates to what is mentioned (for example reason, cause) with falling tone at the end of the sentence.
Only used with:
N／Aな＋のだろう
Aい／Vのだろう

For example

彼女が風邪を引いた。最近風がだんだん強く吹いているのだろう。
Kanojo ga kaze o hii ta. Saikin fuu ga dandan tsuyoku fui te iru no daro u.
She got cold. It must have been because of the windy weather these days.

どこでも歓迎されているから、あの俳優は優秀な俳優のだろう。
doko demo kangei sare te iru kara, ano haiyuu ha yuushuu na haiyuu no daro u.
That actor might be excellent because he’s greeted everywhere he goes.

2. Describe the confirmation based on what was said earlier. This speaking is used mostly by men with rising tone at the end.

For example
来週帰国するのだろう。
raishuu kikoku suru no daro u.
You will come back home next week, won’t you.

A:「試験が完成したので今暇のだろうね…」
B:「ううん。今結果に心配してるので暇のときないよ」
A :「[?] shiken ga kansei shi ta node ima hima no daro u ne?’
B :「[?] uun. Kon kekka ni shinpai shiteru node hima no toki nai yo’
A: “You must be free now after doing the test…”
B: “Nope. I’m worrying about the resut, so I’m not free”.

3. ～のだろうか：Express worried feeling, suspicion of the speaker. It’s used to speulate based on the information the speaker gathering.

For example

留学している息子が今安全のだろうか。
ryuugaku shi te iru musuko ga kon anzen no daro u ka.
I wonder if my son studying abroad is safe.

顔色が悪いね。病気のだろうか.
kaoiro ga warui ne. Byouki no daro u ka .
Your countenance looks bad. You must be sick.

Note: In verbal communication, “のだろう” is turned into “んだろう”

Related structures :

Ref : tuhoconline

above is Japanese のだろう grammar nodarou. if you don’t understand the signs we used in fomation, you can find their meaning here : signs used in Japanese grammar structures.

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