(1) in case
例：He left early in case he should miss the last train.
他动身得早，以免误了最后一班火车。
(2) for fear (that)
例：He handled the instrument with care for fear (that) it should be
damaged.他小心翼翼地摆弄那仪器，以防把它弄坏。
(3) so that
例：Let’s take the front seats so that we can see more clearly.
让我们坐到前面的座位上，以便能看得更清楚些。
(4) in order that
例：He got up very early so that/in order that he might/could catch the early bus.为了赶上早班车，他起了个大早