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Grammar detail: past + ろう (たろう form)

past + ろう (たろう form)
probably is ~
98 words
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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
私
が
きみ
君
なら、そんなことはしなかったろうに。
Were I you, I wouldn't do such a thing.
い adjective
いそが
忙
しかったろう
に、
かのじょ
彼女
は
わたし
私
に
あ
会
いに
き
来
た
。
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
僕
が
きみ
君
なら、そんなばかげたことは
い
言
わなかったろう
に。
If I were you, I would not have said such nonsense.
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Kanji used in this grammar

私
シ   わたくし    わたし I, myself   
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君
クン   きみ you   
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忙
ボウ   いそがしい busy   
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彼
ヒ   かれ he   
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女
ジョ   ニョ   ニョウ   woman; female   おんな woman   め woman   
会
カイ   エ   あう to meet   
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来
ライ   くる to come   きたる to be forthcoming   きたす to induce   
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僕
ボク    me, I   
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言
ゲン   ゴン   say; word   こと word, saying   いう to say   
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