分类：教育/科学-学习帮助
问题：“IF条件句”转换成“……，OR……”时；OR前面是不是一定要跟? 
If you don't work harder, you will fail in the exam（同义句）
1,Work harder,or you will fail in the exam.
2,You must work hard ,or you will fail in the exam.

回答：祈使句时，加逗号。一般句子不加逗号。下面都是对的：
Work harder,or you will fail in the exam.
You must work harder or you will fail in the exam.