by doing sth用法（bydoingsth用法）

make living (by) doing=live by doing 靠…谋生 you can make

英语介词by的用法

介词by用法详解

介词by的基本用法

in doing sth.帮助某人做某事

havesbdoingsth句型

adj06另外be动词最后那两个句型务必记住,语法题会考(后面 doing/to

go 动名词 去游泳 go swimming keep (on) doing sth 去爬山 go

been done being done having been done 动词不 定式 to be doing

2014年春人教版最新八年级英语下册《unit5_what_were_you_doing_when