Jack's family is poor so he needs to work as a waiter in a restaurant after school这里为什么用“as” a waiter?

there is one boy in jack's family. this is...poo poo poo 连词成句：1 Kelsey's,a,is,family,this,of,photo(.)2 is,Tom's,Jack,Green,father(.) Jack usually s(　）weekends with his family Jack's family has one shower.(划线提问) one是划线部分._____ _____ showers does Jack's family have? jack is second child of his family哪里错 Jack is the o▁▁ student in his family This is Emma's family< > 英语翻译短文：This is a photo of Mr Black's family.The man with glasses is Mr Black,the father.The woman is the mother.They have a son and a daughter.The son is behind Mr Black.His name is Jack.He's14.Kate is Jack's sisiter.She is 12.Jack and jack is能不能缩写成jack's?能不能说jack's running?或者说jack's a teacher？ Jack's friends have an English lesson every day?(一般疑问句)Jack's=Jack is Jack's family is poor so he needs to work as a waiter in a restaurant after school这里为什么用“as” a waiter? This is Jack's and Kate's brohter.Jack's and Kate's都加s Today is Jack's ( ) birthday (twelve) Jack,is there anything important____today's newspaper? jack's mum is houswife改错题