often的比較級和最高級？

　　often例句分享

　　Movie stars often prefer to travel incognito.

　　電影明星旅行時(shí)常喜歡隱瞞身份。

　　I often think about my friends back home.

　　我常常想起老家的朋友。

　　Young people are often unconcerned with political issues.

　　青年人對政治問題往往漠不關(guān)心。