uncle Sam and John stand for the USA and the UK为什么这样表达?

uncle Sam and John stand for the USA and the UK为什么这样表达? Uncle Sam and John Bnll stand for后面应填什么 John is Sam and Amy's friend.是否有语法错误? I call my father's mother_____.My uncle has a son,John.john and l are____. 求教英语有趣的单词如hijack、Dear John’s letter求类似 hijack、Dear John's letter 、uncle sam的有趣的有来历的单词,及其来历!灰常感谢!尽量是比较常用的词~！哈 谢谢！ The man （with glass） is Sam's uncle.对括号部分提问 （ ） （ ）is Sam's uncle?John plays computer games at home.改为否定句 John （）（）computer games at home Her father plays tennis（once a week）对括号部分提 at the Uncle John's 还是at Uncle John's如题~ Uncle Sam为什么指代America;John Bull为什么指代United Kindom Sam was watching TV when Uncle John come to visit us.哪里错了? 英国的雅号是什么?A.BigBen B.John Bull C.Hot dog D.Uncle Sam c ,uncle sam d ,sam uncle uncle sam 的来源? he's sam and amy's friend. Mr Shute is a friend of ____.A:John's uncle B:John's uncle's C:John uncle's D:John uncle选哪个?为什么?哪个是对的?A or 原因是什么,为什么是A?为什么是B? Do you know the Girl with brown hair over there? Oh ,that 's Betty .she is a friend of ____ .A.John's uncle B.John uncle's C.John's uncle's D.John's uncles要说为什么 This is ________ car.It looks very beautiful.A.Kitty’s and Sam B.Kitty and Sam’s C.Kitty’s and Sam’s D.Kitty and Sam 是Tom’s and Sam’s room 还是Tom and Sam’s room? 在括号里填：dear daming ：how are you?i（ ）to london last sunday.（ ）john today.he is amy and sam‘s friend.he（ ）in london,near amy and sam.we ate （ ）today.but l （ ）my ice cream on john’s shor!l was so sorry.yourslingling