first和at first 有什么区别?怎么区别什么时候用first,什么时候用at first?

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first和at first 有什么区别?怎么区别什么时候用first,什么时候用at first?
first和at first 有什么区别?
怎么区别什么时候用first,什么时候用at first?

first和at first 有什么区别?怎么区别什么时候用first,什么时候用at first?
first有四个词形:adj. adv. n. pron. 这里主要谈adj.和adv.
first adj.
第一的
Example: He was the first student who arrived at the classroom.
adv. 首先
First I fed the baby. Then I made myself a sandwich.
at first是一个
在句中充当状语
首先
At first I was nervous, but I soon started to relax.
补充一个firstly 修饰句子的副词 首先
The plan was not practical, firstly because of the cost, and secondly because local people did not support it.
通常可互用,但有差别,需查词典体会.网上有的,一搜就好

first
n.第一,最初; 头等;
adv.最早,最初; 首次; 宁愿; 优先;
adj.第一流的; 最初的,最早的; 基本的,概要的;
num.第一;
如:I must water the garden first.我必须先给花园浇水。
at first
adv.起初,当初;
如:I was doing fine at ...

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first
n.第一,最初; 头等;
adv.最早,最初; 首次; 宁愿; 优先;
adj.第一流的; 最初的,最早的; 基本的,概要的;
num.第一;
如:I must water the garden first.我必须先给花园浇水。
at first
adv.起初,当初;
如:I was doing fine at first. 开始我做的很好。

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at first ,一般用于句或段落开头。。
first 一般用来形容某某人或物。