你好，which was presented by one of my friends 是定语从句，修饰gift，希望能采纳，谢谢
it形式主语is谓语gift宾语a lovely作gif定语which was presented by one of my friends 是gift的定语从句。句意是：这是由她的一个朋友赠送的一个可爱的礼物。
