Question

the young man fell in love with the beautiful girl the first time when he saw her . 哪有错？

Answer 1

the young man fell in love with the beautiful girl the first time when he saw her . 哪有错？
the first time后面可直接加从句，when不要。
the young man fell in love with the beautiful girl the first time he saw her .
英语中有些名词结构可用作从属连词，用以引导状语从句，且主要是时间状语从句。
the+序数词+从句 就中其中一个：
其中的序数词包括first, second, third, fourth等，其意为“当第几次……的时候”。如：
My girlfriend beat me at poker the first time we played. 我头一次和女朋友打扑克，她就把我赢了。
The second time I saw her, she looked like an old woman. 我第二次见到她时，她看上去像一个老太婆。
The third time I went there, I found all of them had left and the offices were all empty. 我第三次去那儿时，我发现他们都离开了，所有的办公室都是空的。
但要注意的是：
一、next, last也具有类似序数词的性质，因此也具有以上用法。如：
Next time you come in, please close the door. 下次你进来，请关门。
The last time we talked he said he needed another two days. 上次我们谈话时他说他还需要两天。

二、the first time, the second time, the third time 等用作连词引导时间状语从句时，其前通常要有定冠词，而 (the) next time, (the) last time引导状语从句时，其中的冠词可以省略，如下面这道上海高考题，其答案是C，不是A：
I thought her nice and honest_________ I met her.
A. first time B. for the first time C. the first time D. by the first time

Answer 2

the young man fell in love the beautiful girl when he saw her for the first time