often的用法、在often 后面+圆形还是?什么的、初一英语期中考试、帮我总结下 哪些很主要呢、我给多分.

often意为“经常, 再三”,是副词,不影响主句动词变化,动词依旧根据人称变化
例：
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.
（1）often放在be动词后.
He is often late for school.
他经常上学迟到.
（2）often放在实义动词前.
He often goes to school by bike.
他常骑自行车上学.
（3）often与very或quite连用表示强调时,既可放句中,也可放句首或句末.
My father very often goes to Beijing on business.
Very often my father goes to Beijing on business.
My father goes to Beijing on business very often.
我父亲经常去北京出差.
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
always, often, usually, frequently, repeatedly, regularly
这些副词均表示频度.
always: 总是,永远.语气最强,指在一切时候,没有例外.
often: 经常,语气弱于always,侧重动作发生的次数具有经常性,具体时间意味不强.
usually: 通常,通例地,指习惯性动作,频度仅次于always,较often大,偶尔有间隔.
frequently: 时常,经常,与often同义,可通用,但较正式,强调次数频繁.
repeatedly: 屡次,强调次数多,但反复的频率不一定均匀.
regularly: 用于修饰经常而有规律性的动作.