英语：in order that后面只能加should的虚拟语气吗?rt请讲解用法

不一定，may也可以

不是
He got up earlier in order that he could get to school on time.
1.in order to 一般用in order that加从句来替换；而so as to 一般用so that加从句来替换。in order that 可以在句首，so that和so as to 一样不能在句首。
2.当这两个短语后的不定式动词的逻辑主语和句子的主语一致时，“in order to , so as to +不定式”可以简化为“不定式”
In order to get to school on time,he got up earlier.这个句子可以表达为下列几种方式：In order that he could get to school on time,....
He got up earlier in order to get to school on time.
He got up earlier in order that he could get to school on time.
He got up earlier so as to get to school on time.
He got up earlier so that he could get to school on time.
To get to school on time, he got up earlier. （这种不定式有时可以表示目的以外的状语）

除了用should以外,还可以用may（‘可能’之意）.比如,--I gave her $100 in order that she might buy the bike she had wanted. --In oder that you may get the job, you may have to pass the exam....

不一定的，是目的状语从句，不是虚拟语气