句子拷贝错了,应该是
If you are going to exercise outside,do drink plenty of water.
to 应该是 do
do drink plenty of water 是祈使句
逗号的用法没有错.
我是加拿大人,前英语老师,可是我听到的和文章原文都是to耶，好奇怪？？我已开始觉得应该是do可是听了几遍就是to啊