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だろう・でしょう
darou / deshou
This is the tentative form of the copula. The exact rendering into English varies according to context; but some serviceable translations would be: “I suppose; perhaps; probably.”
Plain form
彼は日本人だろう。
Kare wa Nihonjin darou
I suppose that he is Japanese.
Polite form
あしたは雨でしょう。
Ashita wa ame deshou.
It will probably rain tomorrow.