Structure
Verb + としたら(1)
[い]Adjective + としたら(1)
[な]Adjective + (だ) + としたら(1)
Noun + (だ) + としたら(1)
(1) とすると、とすれば
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About としたら・とすれば・とすると
When partnered with several of the assumption based expressions that are used in Japanese, the case marking particle と may be used to show a hypothesis about a certain result. This is one of the 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 だ.
Related
Examples
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付き合うとしたら、田中さんと山田さんどっちがいい?
If you were to date Tanaka or Yamada, who would you choose?
無料だとすれば、人が大勢来る。
If we suppose it was free, lots of people would come.
留学に行くとすると、論文が必要。
Assuming that you study abroad, an essay is necessary.
買い物に行かないとしたら、晩御飯はどうする?
Assuming that I don't go shopping, what will be done about dinner?
もし会えるとしたら、明日か明後日だね。
Assuming that we can meet, it will be either tomorrow or the day after.
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Further Example Sentences and Breakdown
JLPT Sensei
Making hypotheses with 「とする」
Tae Kim
Purposes of としたら、とすると and とすれば
Japanese Stack Exchange
Offline
Tae Kim's Japanese Grammar Guide
Page 287
Tobira
Page 173
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