Is your sister older or younger than you?
你的姐妹比你大還是小？
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.
我和妹妹過去老是吵架。
My sister came along just to give me some moral support.
我姐姐只是過來給我一些道義上的支持。
She's never really got on with her sister.
她從未與妹妹真正和睦相處過。