(Followed by infinitive)
- In order to, so as to, to (para, con el fin de)
She is saving money to buy a new car.
The company will reduce prices in order to increase sales next year.
Cyclists must wear a helmet not to get hurt in case of accident.
(Followed by a sentence usually including a modal verb)
The library will be open until 12 p.m. so that the students can prepare for their exams.
Her parents sent her to a British school so that she could learn English at an early age.