其实我也被问住了...
所以查了一下权威的语法网站,呵呵,共同进步嘛
By / With
by和with
Means and Methods
意义和用法
A:"How do I get this package open?"
我怎样打开这个包装?
(WITH + NOUN PHRASE BY + GERUND PHRASE
with +名词短语 by+ 动名词短语)
B:You can open it
你可以
+ with a knife. +by by using a knife.
+with a cut of the string. +by cutting the string.
+with a tear at the end. +by tearing open the end.
+with the removal of the wrapping paper. +by removing the wrapping paper.
+with a slit into the box. +by slitting open the box.
我自己也写个例子
Kate:How can I get through this terrible tomb?
我怎么走过这可怕的墓地?
Lily:By walking through quickly/With a quick walk-through.
很快的走啦
By covering your eyes/ With an eye patch.
遮上你的眼镜/戴眼罩啦
By turning into a ghost/ With a mutation into a ghost.
你也变成鬼呗.
参考资料:http://www.grammar-quizzes.com/gerund3.html