频度副词是指用来表示动作或状态发生频率的副词,如always(总是)、usually(通常)、often(经常)、sometimes(有时)、rarely(很少)、never(从不)等。在句子中,频度副词的位置通常是放在行为动词前面、be动词、助动词或情态动词之后,具体如下:
频度副词放在行为动词前面
例如:
I always go to bed before 11 o'clock.
They usually have lunch together.
频度副词放在be动词后面
例如:
She is never late for class.
The weather is often nice in spring.
频度副词放在助动词或情态动词之后
例如:
He can always find a way to solve the problem.
They may rarely have time to travel.
需要注意的是,在现在完成时的句子中,频度副词通常放在have/has之后,如:
I have never been to Japan.
He has often visited his grandparents.
总之,频度副词的位置可以根据句子的结构和语境来确定,但通常放在行为动词前面、be动词、助动词或情态动词之后,用于表示动作或状态发生的频率。