1.in order that
They worked hard in order that they might succeed.他们努力工作，以便能够获得成功。
In order that they might not disturb us they whispered.
他们低声细语，免得打扰我们。
2.so that
He raised his voice so that everyone could hear.他提高了嗓音，以便每个人都能听见。
He took the early train so that he should arrive on time.他乘早班车以便能准时到达。
3.for fear that
He works hard for fear that he should fail.他怕失败，因此工作很努力。
He locked up the document for fear that it （should）be stolen.
他把文件锁好了，免得被窃。