so that后既可跟目的状语从句,也可跟结果状语从句。如何判断?下面的方去可帮助你解决问题。
一.当表达的含义是“ 为了... 以....时，为目的状语从句;当 表达的是以至.....因此”含义时,为结果状语从句。例如:If you do know，answer in a loud- enough voice so that all the class mayhear.(目的状语从句)如果你的确知道,应大声回答，以便让全班学生都可以听见。
It rained hard the day before yesterday ,so that she had to stay at home. (结果状语从句)前天雨下得很大，因此她只好呆在家里。
二、当从句的谓语动词有情态动词can,could,may,might等时,是目的状语从句;当从句里没有情态动词，且谓语动词是一-般 现在时(过去时)、现在完成时等时态时,是结果状语从句。例如:We stopped at Salt Lake City so that we could( might ) visit the monument to seagulls.(目的状语从句)我们在盐湖城逗留，以便可以参观为海鸥修的纪念碑。
They have walked a long way , so that they are all tired. ( 结果状语从句)他们走了很长的路,所以都很累。
三、当从句之前的so that可用in order that代替时，是目的状语从句;反之,是结果状语从句。例如:We now study hard so that we may work well in the future. ( = We now study hard in order that we may work well in the future. )(目的状语从句)我们现在努力学习是为了将来更好地工作。
四、当so that之前有逗号时,是结果状语从句;反之,是目的状语从句。例如:The story is very interesting,so that I like it very much. (结果状语从后、这部小说很有趣，因而我非常喜欢。
Exercise:判断下列句子是结果状语从句还是目的状语从句?
A结果状语从句 B. 目的状语从句
1. He got up early so that he caught the first bus.
2. We learn English so that we can speak to Americans.
3. I hurried so that I wouldn't be late for class.
4. The room was packed with people so that we couldn't get in.
5. The teacher must speak slowly so that the students may understand him.
Key:
1.A 2.B 3.B 4.A 5.B
