often是频度副词,修饰help
very是程度副词,修饰often
副词用来修饰动词、形容词、或者副词本身.
副词的位置比较灵活:
1、修饰形容词或副词,放在被修饰词的前面.
The house is very big. (very修饰big)
2、修饰动词,可以放在宾语的后面:She knows me well. (well修饰know)
频度副词也可以放在助动词和动词中间:I have never seen this film. (never修饰see this film)
3、修饰整句句子,可以放在句首:Luckily, they passed the exam.
你的句子比较特殊,因为often是程度副词,放前放后都可以.