Is your sister older or younger than you?
你的姐妹比你大还是小？
She doesn't play as well as her sister.
她演奏得不如她姐姐。
My sister and I used to quarrel all the time.
我和妹妹过去老是吵架。
My sister came along just to give me some moral support.
我姐姐只是过来给我一些道义上的支持。
She's never really got on with her sister.
她从未与妹妹真正和睦相处过。