often

She wears often casual clothes.
She often wears casual clothes.

I often am at the pub at this time.
I am often at the pub at this time.

Adverbs of frequency such as always, usually, often, sometimes and never normally go in mid position:

• Before the main verb: ‘She often wears casual clothes.’ ‘I usually walk to work.’
• After the verb be: ‘I am often at the pub.’ ‘They are usually tired.’
• After a modal or the first auxiliary verb: ‘She can often help us.’ ‘I have often thought about moving.’

Often can also go at the beginning of a sentence for emphasis: ‘Often, she wears casual clothes.’ However, mid position is the normal choice.