Last time, we looked at using to and for to express purpose. Today, let’s look at some other ways we can express purpose.
In addition to using to + infinitive, we can also use in order to + infinitive. While the meaning is the same, in order to sounds more formal than to.
◆ I’m going to the library to borrow some books. (more casual)
◆ I’m going to the library in order to borrow some books. (more formal)
◆ She borrowed some money from her parents to pay her rent. (more casual)
◆ She borrowed some money from her parents in order to pay her rent. (more formal)
However, with a negative infinitive, it usually sounds more natural to use in order not to + infinitive or in order to not + infinitive.
◆ I am very careful about my diet in order not to gain any weight.
◆ In order to not get lost, please carry a map with you.
◆ I always set two alarm clocks in order not to oversleep.
Another way we can express purpose is with so as to + infinitive.