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Grammar detail: past + ろう (たろう form)

past + ろう (たろう form) - probably is ~
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verb plain past + ろう
or
い adjective past + ろう
or
noun or な adjective + だったろう
is used to express speculation. It means 'probably is ~' or 'probably is the case that ~'.
This form has a somewhat old-fashioned feel. In modern Japanese it would be more common to use past + だろう.
verb
もし
わたし
きみ
ならそんなことしなかったろう
Were I you, I wouldn't do such a thing.
い adjective
いそが
しかったろう
かのじょ
彼女
わたし
いに

Busy as she was, she came to see me.
noun
なんてすばらしいコンサートだったろう
What a great concert it was!
A に is often added after the ろう as an implied joining form. At the end of a sentence, that may indicate that the speaker would prefer the outcome described. For example:
ぼく
きみ
ならそんなばかげたこと
わなかったろう

If I were you, I would not have said such nonsense.
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Kanji used in this grammar

シ   わたくし    わたし I, myself   
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クン   きみ you   
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ボウ   いそがしい busy   
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ヒ   かれ he   
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ジョ   ニョ   ニョウ   woman; female   おんな woman   め woman   
カイ   エ   あ to meet   
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ライ   く to come   きた to be forthcoming   きた to induce   
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ボク    me, I   
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ゲン   ゴン   say; word   こと word, saying   い to say   
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