how to do引导什么从句

　　It tells the reader how to do something.

　　它告诉读者怎样去做某事。

　　People even receive training to learn how to do this.

　　人们甚至接受培训，学习如何做这些。

　　You see how to do this in the next couple of sections.

　　你将在接下来的几节中看到如何做到这一点。