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Ren'youkei + tarou (たろう)
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The rentaikei + たろう (tarou) is the past tense of the subjuncitive form, with the function of the dubitative form. In normal English it should be translated into "probably did".

 

花を買ったろう。(Hana ga kattarou.)
He's probably bought the flowers.

新しかったろう。 (Atarashikattarou.)
It was probably new.

雨が降りましたろう。(Ame ga furimashitarou.)
It has probably rained.

赤かったろうです。 (Akakattarou desu.)
It was probably red.

 

Contractions with group 4 verbs and verbal adjectives
The ren'youkei + たろう (tarou) of group 4 (or yodan katsuyou) verbs, undergoes contractions in many cases. For verbal adjectives the ren'youkei is combined with the verb あったろう (attarou). This combination also undergoes a contraction.

Here's one example of how the contractions work:
買い (naku = ren'youkei) → 買い +たろう (kai +tarou) → 買ったろう (kattarou)

Ren'youkei ends on: -tara form: example:
~い (i) ~ったり (ttari) 買う (kau)
buy
買ったろう (kattarou)
He probably bought.
~き (ki) ~いたり (itari) 書く (kaku)
write
書いたろう (kaitarou)
He probably wrote.
~ぎ (gi) ~いだり (idari) 泳ぐ (oyogu)
swim
泳いだろう (oyoidarou)
He probably swam.
~ち (tsi) ~ったり (ttari) 待つ (matsu)
wait
待ったろう (mattarou)
He probably waited.
~に (ni) ~んだり (ndari) 死ぬ (shinu)
die
死んだろう (shindarou)
He probably died.
~び (bi) ~んだり (ndari) 遊ぶ (asobu)
play
遊んだろう (asondarou)
He probably played.
~み (mi) ~んだり (ndari)

飲む (nomu)
drink

飲んだろう (nondarou)
He probably drank.
~り (ri) ~ったり (ttari) 入る (hairu)
enter
入ったろう (haittarou)
He probably entered.
 

There is only one exception:
行き (iki = ren'youkei) → 行き +たろう (iki +tarou) → 行ったろう (ittarou)

Present tense: Past tense:
行く (iku)
go
行ったろう (ittarou)
He probably went.
 

All other group 4 verbs and all group 2 verbs are regular, as are the irregular verbs する (suru) and 来る (kuru).

Present tense Dubitative form past tense
買う kau 買ったろう kattarou
書く kaku 書いたろう kaitarou
泳ぐ oyogu 泳いだろう oyoidarou
出す dasu 出したろう dashitarou
待つ matsu 待ったろう mattarou
死ぬ shinu 死んだろう shindarou
遊ぶ asobu 遊んだろう asondarou
飲む nomu 飲んだろう nondarou
入る hairu 入ったろう haittarou
行く iku 行ったろう ittarou
いる iru いたろう itarou
食べる taberu 食べたろう tabetarou
出る deru 出たろう detarou
見る miru 見たろう mitarou
する suru したろう shitarou
来る kuru 来たろう kitarou
 

だ (da)
The conditional form of だ (da) is だったろう (dattarou). だったろう is a contraction of であったろう (de attarou).

Present tense Conditional form
ある aru あったろう attarou
である de aru であったろう de attarou
da だったろう dattarou
です desu でしたろう deshitarou
 

Verbal adjectives
The ~たろう (-tarou) form of verbal adjectives is formed by adding あったろう (attarou) to the ren'youkei conjugation. This combination then undergoes the following contraction:
なく (naku = ren'youkei) → なく +あったろう (naku +attarou) → なかったろう (nakattarou)

Present tense Conditional form
高い takai 高かったろう takakattarou
大きい ookii 大きかったろう ookikattarou
新しい atarashii 新しかったろう atarashikattarou
小さい chiisai 小さかったろう chiisakattarou
 

Related pages:
Rentaikei +らしい (rashii)
Rentaikei +みたい(な) (mitai na)
Ren'youkei +そう (sou)
Mizenkei +よう (you)
Adjectives
The particle "な" (na)

 
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