To find this time subtract 7-8 hours before your alarm time 求问两个巨型
问题描述：
To find this time subtract 7-8 hours before your alarm time 求问两个巨型
To find this time subtract 7-8 hours before your alarm time.这句的主语是To find this time不定式做主语吗?
For the first subtract your age from 220 to find your maximum heart rate.这句如果没有For the first,是不是subtract要用现在分词形式?求帮忙分析下,
答
这是命令式没有主语.To find this time是目的.
第二句也是命令式没有主语.正常来说两个substract前面都应有个豆号的.