下面为你归纳频度副词在句中的位置规律：

(1) 表示“经常”，通常放在行为动词之前，特殊动词（助动词、情态动词以及动词 be）之后。如：

He was often late for class. 他上课经常迟到。

We often go skating together. 我们常常一道去溜冰。

You must often come to see us. 你要常来看我们。

(2) 如果句子较短或为了强调，often可以放在句末。如：

You won’t see her often. 你不会常常看到她的。

He thought of him often. 她经常想起他。

We’ve been there quite often. 我们经常在那里。

We went to the theatre fairly often. 我们经常去看戏。

如果句子较长或为了强调，often也可以放句首。如：

Often I miss breakfast and have an early lunch instead. 我常常不吃早餐，而吃一顿早午餐。

有时位于句首或句末是因为本身带有修饰语（如quite, very, so等）。如：

Quite often the phone rings when I’m in the bath. 电话经常在我洗澡时响。

When I was young, I used to play tennis very often. 我年轻时经常打网球。

(3) 有时often不是用于说明句子中的动词，而是用于说明整个句子的，此时也通用于句首。如：

Often, in the evening, we’d hear the sirens. 常常我们会在傍晚听到警报声。

Often, when he should have been doing something useful, he wasted his time drawing little pictures. 常常当他应当干些正经事时，他却浪费时间画小画。

(4) often置于句首时，有时其后可接倒装语序（但这并不是必需的）。如：

Often had she intended to speak of this. 她常想说及此事。

Often did we warn them not to do so. 我们曾多次警告过他们，不要这样做。