だろうか ... だろうと思う
Usage
(V/ いA/ なA->~~だ~~/ N->~~だ~~) + だろう Is used in sentences in the plain style. It is used to express one's opinion conjecturally rather than definitely
Examples
アジアの経済はこれからますます発展するだろう
The Asian economy will probably develop more and more from now on
鈴木くんはいい教師になるだろうと思う
I think Suzuki will probably become a good teacher
Good to know
In conversation, it is usual to append と思う and use it in the form だろうと思う
でしょう is the polite version of だろう
🗣️ male use だろう female use でしょう.
Even more casual 🗣️ final う tends to drop.
Rising intonation -> Elicit hearers confirmation
Falling intonation -> Conjecture (unsure)