instructing的主语是editior?为啥没有逗号隔开呢前面,来表示分词做状语；还是修饰a fax的

the editor at once sent the journalism a fax instructing him to find out the exact .
请问这里的instructing 做什么成分

请教一种英语语法
eg The editor sent the journalist a fax instructing him to.
这里为什么要用instructing,似乎在很多文章中都有这种用法,用to instruct可以吗?

英汉互译

1. When I met him, he was instructing his son how to deal with the car problem. 2. She instructed me in the use of the computer. 3. 老师命令我们下课后把试卷交上。 4.他吩咐我把这些花送给顾客。

the editor at once sent the journalist a fax instructing him to find out the exact
number of steps and the height of the wall.
请问instruct为什么在非谓语上,加ing形式,如果是加变成 to instruct 可以吗,

请问两句中的非谓语动词instructing和compared做什么成分?逻辑主语是谁?
Tests onhealthy volunteers found that they were more likely tofeel a sense of fear at the moment when their hearts are contracting(收缩) and pumping blood aroundtheir bodies,compared with the point when the heartbeat is relaxed.
After addingthe library’s final touches (装点),the familyhung a signboard on the front,instructing users to “take a book,return abook,” and making the Henriksen library,now one of severalhundred like it nationwide and among more than 2,500 in the world,the onlyLittle Free Library in Palm Beach County.

;amusing and instructing us in youth,and comforting and consoling us in age .存在什么句型
分号前面有一句话后才是这句子,感觉句子结构怪怪的

新概念3第五课
the editor sent the journalist a fax instructing him to find out the facts 可不可以将instructing him 改成 to instruct him...