为什么用using?

Then I started to write my own original sentences using the grammar I was learning.

这个句子为什么用using？谢谢大家的帮忙。

www.xkbw.com/FyLinki...=0&UrlID=0&ID=233077　欢迎光临新课标教学网

using the grammar I was learning
在这里作方式状语。

英语语法速查

www.sinoya.com/search_1.asp: www.sinoya.com/search_1.asp