请问这个句子有没错误？句子的主语是什么？
Just because he likesworking out on early morning does not mean he's never gone for a swim at night.
because可以引导主语从句的，但这种句子最典型的使用方法是：
Just because...doesn't mean...
Justbecause a camera is old does not mean it is valuable. 并不可以由于照相机样式老就以为它是值钱的。
Justbecause I won’t join yout doesn’t mean that I’m anti you. 我不加入你们，但这丝毫不意味着我反对你们。
Justbecause he says nothing doesn't mean he’s happy. 他什么都不说，并不意味着他开心。
这种句子也可如此改写：
Justbecause a camera is old, it does not mean it is valuable. 并不可以由于照相机样式老就以为它是值钱的。
Justbecause I won’t join you, it doesn’t mean that I’m anti you. 我不加入你们，但这丝毫不意味着我反对你们。
Justbecause he says nothing, it doesn't mean he’s happy. 他什么都不说，并不意味着他开心。
除以上句式外，偶尔也用于其他句式，但比较少见：
Justbecause a family has money does not guarantee that the children haveresponsible and caring parents. 并非说家有孩子子就必然会有负责、关心爱惜他们的爸爸妈妈。
