often的用法?按所给词语的正确形式填空;he__（often）study at night是he often ——（

often 英音：['ɔ:fən] 美音：['ɔfən]
adv.（副词）
经常,再三
How often does the train run?
这火车多久一班?
【说明】此词一般用于动词之前,be 和助动词之后,有时也用于句末以加强语气.如:We often go there.We have often been there.We haven't been there very often.
习惯用语
as often as 每当
as often as not (=more often than not) 多次,屡次,往往
every so often 偶尔,有时
once too often 又一次,再一次,次数太多
often and often 屡次三番,经常
问：he often ——（study ）at night
答：He often studies at night

often表示通常
应该填studies 要用第三人称单数

能不能换意思相近的 be used to 也是经常的意思
因为后面的study不是第三人称格式，没有加s，而study的第三人称单数是studies。ofter的话，后面动词是单数
答案在上文找