usually和often可以互换。usually是经常often是通常，两者都是频度副词，但是表达的程度不一样，usually表示常常会做,时间较长；often表示频率高。

例句：She felt more than usually hungry after her excursion。远足后，她比平时感觉更饿。They ate, as they usually did, in the kitchen。像平常一样，他们是在厨房吃的饭。I've often wondered what happened to him.我时常纳闷他出了什么事。Try to exercise as often as possible.尽可能经常锻炼。