f打头的都有什么单词家庭成员She is not my sister,she's my f____ ___填什么

f打头的都有什么单词家庭成员She is not my sister,she's my f____ ___填什么 She is a sister of my ____ (sister) 填什么 She's my sister.变否定句时,写成She's not my sister或She is not my si This is my a（ ）,Mary.She's my mother's sister.括号里面要填什么?急要! who is the ( ) girl?She's ( )my sister.填冠词 She is a friend ( )my sister's.填介词 -Who‘s{ }girl? -She’s my sister 括号里面填什么 My sister is ___(认真的)and she works hard she is my sister. She is a friend ( )my sister's My( )sister works in a hospital and she is a nurse 括号里填什么? 1,she isn't my sister;2,she's not my sister;这两个写法都对吗?感觉看到书上的