祈使句+or

【问】 Write it down，or you'll forget it.请解释句中or的含义和用法。

【答】 与祈使句+and一样，祈使句+or也相当于一个条件句，不过意义是否定的，即祈使句+or=if not或unless。

1. Write it down，or you'll forget it. (=If you don't write it down，you'll forget it.)

写下来，否则你会忘的(如果你不写下来，你会忘的)。

2. Don't eat so much，or you'll be sorry.

不要吃那么多，否则你会后悔的。

3. Give it back to me，or I'll tell your mother.

把它还给我，否则我告诉你妈妈。

4. Work hard，or you won't be able to pass your examination.

努力学习，否则你无法通过考试。

5. Go，or I'll call the police.

滚开，否则我叫警察了。

6. Do that at once，or you will be punished.

立即干活，否则你们会受到惩罚。