clauses of purpose: 'in order to' and 'so that'
/ in order to…. / so as to….
are right, Gyonggu. If we use in order to it sounds a bit
more formal and explicit than to by itself, but both are
equally possible in both spoken and written English.
both convey exactly the same meaning when expressing purpose:
cut the tree down, I had to hack through the undergrowth first.
order to cut the tree down, I had to hack through the undergrowth
order to is normal before a negative infinitive. We do not usually
use to by itself here:
order not to oversleep, I set the alarm for seven o’clock.
walked very slowly across the room with the drinks in order
not to spill them.
that.../ in order that ...
structures are also frequently used to talk about purpose, although
so that is more common and less formal than in order that.
that these structures are normally used with (modal) auxiliary verbs.
staying on in Australia for nine more months so that he
can perfect his English.
staying on in Australia for nine more months in order to perfect
going to leave by three so that we don’t get stuck in the
going to leave by three so as not to get stuck in the rush-hour
had an afternoon nap so that he wouldn’t fall asleep at
the concert later.
had an afternoon nap in order not to fall asleep at the
order that you may pass the exam, we recommend you read through
all your notes. (Very formal.)
order to pass the exam, we recommend you read through all
your notes. (Less formal.)