However, some students like computer games so much that they even go to the computer bar to play games until late at night, which will certainly have a bad effect on their study.

【翻译】然而，有些学生非常喜欢电脑游戏，（以至于）甚至到网吧玩到深夜，这对他们的学习肯定会造成不良影响。

本句只有一处错误：非限制性定语从句只用which引导，不用that。本句which 指代整个前文的内容，所以翻译成“这；这样做”。

will have 中间加了一个副词状语 certainly，所以不能说will has。