My friend's sister's only one year old.译英,

My sister's boy friend是什么意思 My friend's sister's only one year old.译英, one of my sister's friend 后用加S吗 “A friend of my sister”表达正确吗?还是应该是“A friend of my sister's”? She is a friend ( )my sister's.填介词 sister math friend's my teaches(.)连词成句 sister math friend's my teches 连词成句 a friend of my sister's是什么意思? “My sister's friend's name's Tom”的一般疑问句 The girl is Susan.She is -- A,a friend of my sister.B.my sister's a friend Ca friend of my sister' S __is my sister my sister's name My sister's friend's name is (Dan)对括号处部分提问 he's my friend, at my friend's Look at the girl in red,she is____A.one of Tane's sister B.a friend of Jane's sister's C.my a friend D.Jane sister's friend My mother's s.is my sister. My best friend is s----- to my sister把横线上给我添上，以s开头的单词，