Grammar Info
N3 Lesson 5: 7/21

とすると
if it were the case that, assuming that...

Hypothetical

Structure
Verb + したら(1)
[い]Adjective + したら(1)
[な]Adjective + () + したら(1)
Noun + () + したら(1)

(1) するとすれば
Details
Register Standard
使用域 一般
Information
When partnered with several of the 仮定(かてい) ‘assumption’ based expressions that are used in Japanese, the 格助詞(かくじょし) (case marking particle) と may be used to show a hypothesis about a certain result. This is one of the 結果(けっか) ‘result’ highlighting uses of と. Structures that may be seen are as follows:
(A) としたら (B) - When (A) is the result (B).
(A) とすれば (B) - If the result is (A), (B).
(A) とすると (B) - A result of (A) will be (B).
Although these nuances are slightly different, realistically they are used in almost exactly the same way, to express a possible (undetermined) result. This can be translated to ‘assuming that (A)’, or ‘if it were the case that (A)’.
To use these expressions, simply attach と and your chosen variation of したら to the end of any verb/い-Adjective, or noun/な-Adjective followed by .
  • 来週(らいしゅう)出(で)かけるとしたらどこに行(い)きたい
    If we were to go out next week, where would you want to go?
  • 歯(は)痛(いた)いとすれば、虫歯(むしば)かもしれません。
    If your tooth hurts, you might have a cavity.
  • この壁(かべ)が真(ま)っ直(す)ぐだとすると、こっち壁(かべ)は斜(なな)めっていうこと?
    Assuming that this wall here is straight, does that mean that this one here is slanted?
  • 通勤(いどう)手段(しゅだん)車(くるま)だとしたら、交通費(こうつうひ)は出(で)ません
    Assuming that your mode of transportation is your car, transportation will not be compensated.
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付(つ)き合(あ)うとしたら、田中(たなか)さんと山田(やまだ)さんどっちがいい
If you were to date Tanaka or Yamada, who would you choose?
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無料(むりょう)とすれば人(ひと)大勢(おおぜい)来(く)る
If it is free, lots of people will come.
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留学(りゅうがく)行(い)くする、論文(ろんぶん)が必要(ひつよう)
Assuming that you study abroad, an essay is necessary.
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Books
Tobira
Page 173
Tae Kim's Japanese Grammar Guide
Page 287