At a glance
～とすると means "supposing that..." or "if we assume that...". It sets up a hypothesis and then states the result, judgment or question that follows from it.
[Verb / い-adj plain form] + とすると、[result]
[な-adj / Noun] + だ + とすると、[result]
この話が本当だとすると、大変なことになります。 If this story is true, things will get serious.
How to form it
とすると attaches to the plain form:
| Attaches to | Example | Meaning |
|---|---|---|
| Verb (plain) | 行くとすると | Supposing (someone) goes |
| Verb (plain past) | 当たったとすると | Supposing (it) had won |
| Verb (plain negative) | 来ないとすると | Supposing (someone) doesn't come |
| い-adjective | 高いとすると | Supposing it's expensive |
| な-adjective + だ | 便利だとすると | Supposing it's convenient |
| Noun + だ | 先生だとすると | Supposing (someone) is a teacher |
The past form before とすると describes a hypothetical completed event. It does not mean the event really happened.