often不是情態(tài)動詞。情態(tài)動詞后面要接動詞原形。情態(tài)動詞有:can may must should could 等。often是個頻度副詞，和一般現(xiàn)在時態(tài)連用，通常表示經(jīng)常發(fā)生的動作。often的位置：表示“經(jīng)常”，通常放在行為動詞之前，特殊動詞（助動詞、情態(tài)動詞以及動詞be）之后。

often的用法

often的用法：一般用于動詞之前, be 和助動詞之后, 有時也用于句末以加強語氣。

1.often放在be動詞后。

He is often late for school.

他經(jīng)常上學遲到。

2.often放在實義動詞前。

He often goes to school by bike.

他常騎自行車上學。

3.often與very或quite連用表示強調(diào)時，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.

我父親經(jīng)常去北京出差。

often的短語

every so often

有時,偶爾 sometime

Every so often, she takes a weekend in London.她有時在倫敦過周末。

as often as not

1.經(jīng)常;在通常情況下

其實我有兩個家，因為我常去她家里。

I had two homes really, because as often as not I was down at her house.

more often than not

1.往往，多半

食物很少，他們經(jīng)常挨餓。

food is scarce and more often than not they go hungry.