sth is done by sb；

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sth is done by sb；
求分析句子的语法结构

此为被动语态的基本结构
被动语态基本结构如下：
主语+be +过去分词(+by+动作的发出者）
① 一般现在时：am/is/are+过去分词
如：
Trees are planted every year. 树每年被种.
② 现在进行时 am/is/are+ being +过去分词
如：
The road is being repaired. 路被修.
③ 现在完成时 have/has + been +过去分词
如：
The work has been finished. 工作被完成.
④ 一般过去时 was/were + 过去分词
如：
The story was told by him. 故事被他讲.
Many birds were killed last year. 许多小鸟去年被杀.
⑤过去进行时 was/were+ being + 过去分词
如：
The new house was being painted when I got home. 新房子在我回家的时候被漆好.
⑥过去完成时 had +been+ 过去分词
如：
He told me that the work had been finished. 他告诉我工作被完成了.
⑦一般将来时 will +be + 过去分词
如：
The problem will be discussed tomorrow. 这个问题将在明天被解决.
⑧ 过去将来时 would/should +be +过去分词
如：
He said that the Christmas tree would be put up soon.他说这颗圣诞树将被砍到.
⑨情态动词的被动语态
情态动词+ be +过去分词
如：
The problem must be solved soon.这个问题必须被解决.
Children should be taught to love animals.孩子们应该被教育爱好动物.
望采纳.

Sth is done sth by sb It is first time that sb.have done sth. sth run out of by sb 还是sth is run out of by sb by sth for sb by sth ______ sb by sth for sb. if sb had done sth/ sb have done造句 by sth.to sb.还是by sth.for sb. sb learn sth by oneself have sth./sb.done的用法, observe sb.\sth.done的例句急! let sb/sth do还是done