将下列英语句子改为被动语态

1。This song is often sung by Chlidren。2。The Great Wall is known by people all over the world 。3。All the questions were answered by John 。4。The window was broken by Torn 。5。I was told to wait here for him ( by him) 。---by him 可省略。6。The children are being taken care of by Mary 。7。A new bridge was built over the river by us last year。8。He is called little old man by people 。9。This kind of watches wasn't made in Beijing by them。10。English is spoken in almost all the countries in the world ( by people)。。---by people 可省略。11。Tea grows in China。-------该句子无被动语态,主动语态结构为：主语S + 谓语V（不及物动词vi),主动语态不含有宾语,故无法做被动语态的主语。12。The work can be finished the day after tomorrow by us。13。Must all the exercises be down by me?14。The books must not be taken out of the library by you。以上涉及到的就这四种：一般现在时被动语态构成：am\is\are +过去分词 一般过去时被动语态构成：was\were + 过去分词 现在进行时被动语态构成：am\is\are+being +过去分词 含情态动词的被动语态：情态动词 + be +过去分词