the first time, for the first time, by the first time怎么区别呢？
for the first time是个时间状语,yesterday怎么用,放在什么地方,for the first time就能放在什么地方.the first time则是引导时间状语从句,when怎么引导时间状语从句的,the first time就能放在什么位置.考试时把你熟悉的yesterday,when带进去看看语法对不对就可以了.I saw the film for the first time.THe first time I saw the film,I loved it very much.
区别是：
for the first time 做时间状语，意思为首次、第一次。at the first time 做时间状语，意思为起初、第一次。
例句辨析：at the first time
The crabs broke this thin net at the first time.
下第一次笼子之后螃蟹就将这个细网子弄破了。
It seemed a good sign that they're cordially hobnobbing at the first time meeting.
第一次见面他们就谈得这么热乎，看来是个好兆头。
I just brought four chicken legs, but two of them were gone at the first time.
我只带了四个鸡腿，但是第一次下龙子之后就丢了两个鸡腿。
Chris has adopted an almost crazy passion for theatre and this feeling began as early as hetouched theatre at the first time.
张克士对戏剧有一份近乎痴迷的热爱，这种情感从他第一次接触戏剧就开始了。
Generally, there are too many job seekers with bachelor's degree, so they are paid little when they find jobs at the first time.
通常来说，求职者有大部分都是大学学历，所以大学生第一次找工作的时候得到的报酬很低。
for the first time
I remember seeing the ocean for the first time.
记得十八岁那年，我第一次看到海洋。
We saw rivers for the first time in days.
这么许多天来，我们第一次看见了河流。
They now work directly together for the first time.
如今，父子俩第一次直接在一起工作了。
Christmas was nice but bittersweet; for the first time since my brother was born, there were onlythree of us.
圣诞节很快乐，但也是甜中有苦，自从弟弟出生后，这是第一次只有我们三个人过圣诞节。
Mitigation really focused on the fact that for the first time in the Copenhagen Accord all the major economies agreed to implement either targets or actions.
关于减缓的讨论真正聚焦这样的事实，既首次在哥本哈根协议中，所有主要经济体同意实施或目标或行动。
参考资料
有道词典：http://dict.youdao.com/w/for%20the%20first%20time/#keyfrom=dict2.top
for the first time 介宾词组作状语
by the first time 不是一个固定词组，可能是by+the first time+从句
很简单
1 the first time (是连接词，用于主将从现和主过从过的句子中)，
I was a boy of 16 THE FIRST TIME(=when) I came to this place (主过从过)
==I was a boy of 16 WHEN I came to this place FOR THE FIRST TIME.
You will like him THE FIRST TIME(==when) you see him next week(主将从现)
==You will like him WHEN you see him FOR THE FIRST TIME next week.
2 for the first time （第一次，往往用于简单句）
In 2009,he came to Shanghai for the first time
3 by the first time (翻译：在第一次以前)
Those people had heard so much about him BY THE FIRST TIME they saw him himself last year. (那些人在去年见到他本人以前就已经听说过他的许多事情)
子龙金利： for the first time 多在句子中表示“第一次做过的事情”for the first time,第一次做某事, 不能加从句.常用现在完成时. I have been here for the first time.the first time 更侧重“第一次的情况”the first time 常引导一个从句, 如: The first time time I saw you, I realized I semmed to have met you somewhere before.相当于as soon as This is the first time I've been here.
安吉县18892559056： the first time是什么意思 - ？
子龙金利： the first time 第一次 双语对照词典结果: the first time [英][ðə fə:st taim][美][ði fɚst taɪm] 初次;以上结果来自金山词霸例句:1. We rarely get things right the first time. 我们几乎不可能第一次就把事情做对. . ----------------------------------- 如有疑问欢迎追问! 满意请点击右上方【选为满意回答】按钮
安吉县18892559056： the first time 和for the first time区别例句 - ？
子龙金利： the first time和for the first time的区别:意思不同、用法不同、侧重点不同 一、意思不同1.the first time意思:第一次;初次;第一次……的时候2.for the first time意思:第一次 二、用法不同1.the first time用法:用作形容词一般修饰单数名词,修饰...
安吉县18892559056： the first time是什么意思？
子龙金利： the first time 第一次 the first time [英][ðə fə:st taim][美][ði fɚst taɪm] 初次; 例句: 1. We rarely get things right the first time. 我们几乎不可能第一次就把事情做对.
安吉县18892559056： the first time和 for the first time的区别 - ？
子龙金利： for the first time 是介词短语,作句子的时间状语的 the first time 是引导状语从句的连接词 example The first time I went to England, I was impressed by its beauty. When I went to England for the first time,. I was impressed by its beauty.
安吉县18892559056： the first time 什么意思?急 - ？
子龙金利： 时间状语从句, 原句整句是个完整的句子, 而the first time 引导的从句又有它独立的主谓宾, 所以称它为原句的从句. 也就是时间.... 就像楼上翻译的那样, 具体的也可跟着语境翻译. 有问题继续问..
安吉县18892559056： fo the first time 和the first time 的区别？
子龙金利： 你好. the first time 第一次,是名词,在句子中只能做名词的成分. for the first time 也是第一次,是个副词短语,在句子中做状语. 例子: He won the match at the first time. 他在第一次比赛中就获胜了. For the first time I felt repentance and sorrow. 我第一次感到后悔,感到难过. 希望对你有帮助.
安吉县18892559056： the first time 和 for the first time的区别 - ？
子龙金利： the first time 第一次 例句:This is the first time for me. 对于我来说这是第一次.for the first time 因为是第一次 例句:We must start early, for the first time will take two hours to drive to the airport. 我们一定要早点动身,因为是第一次开车去机场将要花两个小时.
安吉县18892559056： the first time ,,at the first time,,for the first time,,这三个词组怎么区分? - ？
子龙金利： 马上.介词短语如:I got up at the first time .(我立刻起床了)for the first time 意思为第一次(往往和现在完成时搭配使用the first time 是连词.如:I fell in love with this girl the first time I met her.(我第一次见到这个女孩就爱上了她)at the first time 表示第一时间.)如:I have palyed this game for the first time.(我第一次玩这个游戏.) 望采纳
安吉县18892559056： for the first time 和 the first time的区别,请详解 - ？
子龙金利： for the first time 直接作时间状语,是副词词组 the first time是名词词组,后面接状语从句才可以
