Gina isn' t my sister. She's

Gina isn' t my sister. She's 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 The pencil isn’t m___,it's my sister My aunt has a sister.She isn't my aunt.Who is she?A.my mothe Mary isn't Bill's aunt.But she is Bill's aunt's sister.Who i My friend isn't in her office.She's __________. 初二下英语试题You are Andy's sister,A isn't she B aren't you C isn' Beth isn't my sister.------mycousin My sister isn`t good at maths My sister is good at ___(sing),but she isn't good at ___(dan My sister's Brown's daughter,but Brown isn't her momther,Bro lf your uncie's sister isn't your aunt,what relation is she