副词位于句首需要倒装吗

不一定的，

否定副词位于句首时的倒装在正式文体

例如：never,seldom,rarely,little,hardly,scarcely,nosooner,nolonger,nowhere等含有否定意义的副词若位于句首, 引起倒装

tal silence. It was absolutely necessary, therefore, to think of

倒装句
1，句首状语为方位词或拟声词，谓语动词为go，come等表示位置转移的动态动词是，通常用全部倒装。
bang，bang，bang ，come the robbers。
the door burst open and in crushed the crowd。
主语是代词就不用倒装，lower and lower he bent。
2、句首状语为表示地点的介词词组时，会引起局部倒装
in this chapter will be found a particular answer。
3、句首状语为否定词或带有否定意义的词语时，一般引起局部倒装。
Never have I found him in such a good mood。
4、当句首状语由“only+ 副词”、“only+ 介词词组”、“only+状语分句”构成，也可引起局部倒装。
Only yesterday did he find out his book。
Only through this way could you get there。
Only because it rained did not we go there。
以关联连词not only （…but also）开头的分句。往往引起局部倒装。
Not only did he complain about the food，he also refused to pay for it。
5、在以关联连词so（…that）开头的句子结构中，“so+形容词”是主语补语的前置，“so+副词”是状语的前置，前者引起全部倒装，后者引起局部倒装。
So small was the mark that I could hardly see it。
So much does he worry about his work that he can not sleep at night。
6、当方式状语、频度状语等移至句首时，有时也引起局部倒装。
Many a time has Mike given me good advice。