first, firstly, first of all, at first的区别
通常可互用，但有差别。
*first常用于开场白。常用于first…secondly…lastly。例：①First I fed the baby. Then I made myself a sandwich.②Who came first in the race? ③“Do you want a drink?” “I’ll finish my work first. ”
*firstly强调第一个（做完的），有次序关系。常用于列举一系列原因、看法、评论及方式等或用于分开并依次列举所述各点，此时和first (of all) / in the first place / to start with / to begin with没有什么区别的，可以替换。例：①The plan was not practical, firstly because of the cost, and secondly because local people did not support it. ②There are three reasons why I don’t like him: first(ly)/ to start with he’s rude, second(ly) he’s a liar, and third(ly) / finally he owes me money.
*first of all用于开场白，指次序上的“首先”“第一”，强调事物排列顺序，后面往往接next, then等。例如: First of all，you're supposed to intbegin和start区别roduce yourself before speaking. 人们用first (of
all) [而不是firstly ]，并且往往根据时间顺序依次列出一系列的动作。如：First of all I get dressed, next I bring in the paper, then I fix breakfast.
*at first= at the beginning 最初，最早时，起初，没有次序关系；强调时间顺序，在第一的位置，一开始……，强调第一状态（时间、空间）；只能用于表示一段时间，常与稍后的一段时间作比较。to start / begin with 和in the beginning 也可以这样用。例：①At first I was nervous, but I soon started to relax. ②At first I didn't want to go, but I soon changed my mind. ③You’ll find it difficult at first / to begin with, but later / soon it’ll get easier.

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