This phrase means 'if we assume' or 'supposing that'. You use it to talk about a possible situation.
Clause + とすればPrimary
This phrase means 'if we assume' or 'supposing that'. You use it to talk about a possible situation.
その話が本当だとすれば、我々はすぐに対応しなければならない。
If that story is true, we must respond immediately.
彼が犯人だったとすれば、動機は何だったのだろうか。
Supposing he was the culprit, what could the motive have been?
飛行機で行かないとすれば、新幹線が一番早い選択肢です。
Assuming you don't go by plane, the Shinkansen is the fastest option.
この計画の成功率が低いとすれば、別の案を考えるべきだ。
If we assume the success rate of this plan is low, we should consider another proposal.
全員が参加するとすれば、もっと広い会場が必要になりますね。
Assuming everyone participates, we will need a larger venue.
This phrase is like saying 'Let's pretend this is true for a moment.' You are setting up a pretend situation. Then you think about what would happen next. It helps you explore ideas.
Both "〜とすれば" and "〜としたら" mean "if". "〜とすれば" is more formal. You use it for facts or in writing. It helps you think logically. "〜としたら" is more casual. You use it when speaking. It is for many kinds of "if" situations. This includes personal or unreal ideas.
Use this when you want to set up a situation. Then you can talk about what might happen next. It helps you think through ideas clearly.
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