because后面通常引让闷侍导原因状语从句。
and和but就是连接词,前面是从句后面就罩侍是从句,前面是坦吵主句,后面就是并列的另一个主句。
可以,碰喊例如:配吵巧培键 I want to be your friend because you are so kind.
I waited a long time but he didn't answer my question.
You asked me a question and I replied at once.