一、often

　　adv.經常;常常;時常;再三

　　例句

　　1、This resulted in overpriced and often inferior products

　　這就導致了標價過高而往往質量低劣的產品的出現。

　　2、People often have incorrect information about food.

　　人們對食物經常會有不正確的認識。

　　3、She was often downright rude to him.

　　她常對他十分粗魯。

　　二、usually

　　adv.通常，經常，平常，慣常地;一直，向來;

　　例句

　　1、This year hotels that usually are jammed had vacancies all summer.

　　今年，那些通常爆滿的旅店整個夏天都有空客房。

　　2、Finance is usually the biggest problem for students.

　　經濟問題通常是學生最大的問題。

　　3、This condition usually clears up with regular shampooing.

　　這種情形通常多用香波洗洗頭即可消除。