first作序数词或形容词，就是“第一”，“最初”的意思

1.She won first place in the race. 表示名词的时候，前面的定冠词可以不用

2.This is the first time(that) i have heard of it. 这种句子，that引出的从句必须用现在完成时，如果主句的谓语用的was，那从句就必须用过去完成时。像下面的具体

3.That was the first time they had been alone together.

4.They haven’t the first idea what it means. 这里的the first意思是“最初的一点点”。用于否定句

first作副词是“开始时”，“初步”的意思

1.First think and then speak.

2.She lived in Beijing first and last about ten years.

first的常用搭配

最初：At first

直接地：At first hand

乍一看：At first sight/glance/appearance

首先：First and foremost=first of all=first off=in the first place

第一次(作状语)：For the first time

从一开始：From the first

从头到尾：From first to last

第一次，首先：Firstly