Expressing purpose with so that / in order to
Main clause + so that + subject + modal/base clause; or main clause + to/in order to + base verb
so that + subject + won't/don't + base; to avoid + noun/verb-ing
Why did ...? → to/so that ...
💡 Use so that for subject + verb; use to/in order to before base verb. In order to is more formal.
✓She whispered so that she wouldn't wake the baby.
✗She whispered so that to not wake the baby.
Use so that + subject + wouldn't.
✓I stayed to finish the report.
✗I stayed for finish the report.
Use to + base verb for purpose.
✓We left early in order to get seats.
✗We left early in order get seats.
Include to after in order.