像often always …………之类的词都是些什么词,在句子中的位置是怎么样的?一般放在句首还是句尾?

always,often,usually,somtimes,hardly等频度副词一般放在句子中间,其位置是：be动词、情态动词、助动词之后,行为动词之前.如：
He often goes to the movies on Saturdays.
She is usually the first to get to school in her class.
often 也可以放在句尾,但是得要有quite,very等修饰语.
sometimes还可以放在句首或句尾.