不一定,副词修饰动词时位置比较灵活,可以放在句首,句中,句尾都行.
如：
He went away happily./He happily went away./Happily he went away.
放在句中时,一般置于系动词/情态动词/助动词之后,实义动词（又叫行为动词）之前.
如：
He is always late for school.
He carefully walked through the street.
I have never been there.
是不是所有副词都要放在它所修饰的动词之后?