because的用法及例子详解如下：
because 连词，表示“因为”
1.because + 表示原因的句子
The boy ran away because he was scared.
那个男孩子跑走了，是因为他害怕。
The little girl can’t go to school because she was not old enough.
小女孩不能上学因为她的年纪不够大。


because语气很强 
表示直接因果关系时，用because表示原因

2.用作why问句的答语
--Why did you call? 
–Because I missed you.
--你为什么打电话来？
--因为我想你了呢。

3.because从句可放在 主句前 或 主句后，更常用于主句后
放在主句前 时，通常要用 逗号 与主句分开；
放在主句后时，则不需要逗号。
He was ill because he drank too much wine.
= Because he drank too much wine, he was ill.
因为他喝太多酒，所以生病了。

We were late because we overslept.
=Because we overslept, we were late.
因为我们睡过头了，所以迟到了。

4.注意because不要与so连用
Because I missed you, so I called. (×)
I missed you, so I called.
= I called because I missed you.