When operating the machine,follow the instruction closely,or you might get injured
问题描述：
When operating the machine,follow the instruction closely,or you might get injured
为什么是follow而不是following,前面用的是operating呀,当他操纵的时候同时也应该遵循说明书的介绍啊,两者 应该是伴随状态呀
答
follow the instruction closely其实是主句,它是省略了主语you 的祈使句,用动词原形开头.when operating the machine是时间状语从句,它等于 when you operate the machine.
这个句子也可以写成：Follow the instruction closely when operating the machine,or you might get injured.