first of all 和first可以换用吗

first of all的意思是“首先”，是有一种步骤感，后面还要跟着其次等；first的用处就比较广，作名词、形容词、副词都可以。

例如At first they all thought I was a loony.一开始他们都以为我是个疯子。My aim was first of all to determine what I should do next.我的目标首先是要确定自己下一步该做什么。