He worked day and night so that he could
make up for the lost time.
Why don't you come to the meeting slightly
earlier so that we can discuss the matter privately beforehand?
I spoke as loudly and as clearly as possible
so that everybody could hear me.
You'd better see a doctor at once so that
your illness won't be past curing.
Get ready to meet any possible accidents
so that you won't be upset in an emergency.
I make it a custom to see what are popular
among young people so that I will not fall behind the times.
≒ I make it a rule to see what are popular among young people
lest [for fear] I should fall behind the times.