differences

[همس الكون]

What's the difference between these two sentences:
I met the boy who saw the accident
and
I met a boy who saw the accident

[Ƹ̴Ӂ̴Ʒ EsLaM MaSHaL Ƹ̴Ӂ̴Ʒ]

I met the boy who saw the accident
and
I met a boy who saw the accident

اعتقد ان تاني جمله دي غلط لانه شاف الولد للمره التانيه مش الاولي يعني نستخدم the
ولا السؤال ده المفروض نبصله من ناحيه تانيه؟

يريت حد من المدرسين يوضحلنا

[tamer200]

اعتقد ان الجملة التانية انا شفت ولد من مجموعة اولاد شافوا الحادثة

[rokma]

I think both sentences are correct. In the first sentence, The speaker (I) met the only boy who saw the accident. In the second sentence, the speaker (I) met one boy of those who saw the accident.