often是副词,表示时间发生的频率.意思为经常.often常放在动词的前后,一般规律为：1.主语+行为动词,直接放在动词前,主语后.2.主+系+表 放在系动词后面 例子：
1.He often goes to school this time.
2.It is often a good season.