Question

Tom was ill so that he didn't go to school.错在哪？为什么？

Answer 1

错在so that的用法上。so that的意思是为了.../ 以便..
如果需要用so that来表达，应该是用so...that.....：是 如此...以至于 的意思

Tom was so ill that he didn't go to school.
如果只是一般的，就可以直接写：Tom was ill so he didn't go to school.

Answer 2

so that---以便的意思， 听起来像是为了不去上学，他故意生病，讲不通

应该是
Tom was so ill that he didn't go to school

Answer 3

so that 结果, 以致 如；Everyone lent a hand, so that the work was finished ahead of schedule.每个人都帮了忙, 所以工作提前完成了。所以，我认为Tom was ill so that he didn't go to school。也不错。