频度副词常用在句中,其位置与有无助动词有关.句中无助动词或情态动词时,位于动词be之后,其他动词之前,如：
She is sometimes late.
She sometimes comes late.
We occasionally saw him walking along the river bank.
Films like this rarely reach the big screen.
动词带有一个或一个以上的助动词或情态动词时,位于第一个助动词或情态动词之后,如：
She has sometimes been coming late.
Do you often hold such parties?
He has never been late.
It has occasionally been done.
An Lee has never directed a martial arts film before.
注意：(1)句中副词如移至助动词之前则是为了强调紧跟在其后的助动词.如：
He never has been and never will be successful.
他现在和以后都不会成功.(强调助动词has和will)
You always were generous.你总是很慷慨.
所以这句话对着呢