用 do sth by doing sth和do sth by mistake 造句
问题描述：
用 do sth by doing sth和do sth by mistake 造句
答
Finally,I realise my dream by working hard.
最终，我通过不懈的努力实现了梦想。
第二个楼上造的算标准的了吧
答
by+doing
答
The man helped her by picking up her bag.
那人帮她捡起了包.
I took my brother's pen by mistake.
我不小心错拿了我哥哥的钢笔.