1Iwasgivenanewdeskasapresentbymother.因为是双宾语,也可以说是：Anewdeskwasgiventomeasapresentbymother.

　　2个人觉得这句话表达有错我觉得应该是Imadeformylittlebrotheramodelshiplastweek可改成Amodelshipwasmadeformylittlebrotherbyme.

　　3Ann'shomeworkmustbefinishedbyherfirst.

　　4Iwasoftenpassedmypenbyhim.或Mypenwasoftenpassedtomebyhim.

　　5Wereyouboughtthebookyouwantedbyhim?（这种句子不熟悉的话可先将它变成陈述句,再转变被动态,再变成一般疑问句）

　　6Hewasseentogointotheclassroombyme.(不带to的不定式,变被动态to要还原）

　　7Whoistheoldgrannyoftentakencareofby?

　　8Atickettoaballgamecouldbegiventohimbyyou.或Hecouldbegivenatickettoaballgamebyyou.

　　9Ourclassroommustbekeptcleanbyus.

　　10Theflowersshouldbewateredeverydaybyyou.

　　11Hemaybeinvitedtothepartybythem.

　　12Youwillbeaskedsomequestionsbytheteacher.

　　13AcoatislookedaftercarefullybyBill.

　　14Somemoneywasleftonthetablebyher.

　　15500Englishwordshavebeenlearnedbymefortwoyears.

　　建议你先自己做,做完在对一下!这是学英语的基础!