（说明原因）因为，由于 You use because when stating the reason for something.
He is called Mitch, because his name is Mitchell...
Because it is an area of outstanding natural beauty, you can't build on it...
Women are doing the job well. This is partly because women are increasingly moving into a man's world...
'Why didn't you tell me, Archie?'— 'Because you might have casually mentioned it to somebody else.'
（作出解释）因为 You use because when stating the explanation for a statement you have just made.
Maybe they just didn't want to ask too many questions, because they rented us a room without even asking to see our papers...
The President has played a shrewd diplomatic game because from the outset he called for direct talks with the United States...
I had a sense of déjà-vu because I could recognise everything in London.
因为；由于 If an event or situation occurs because of something, that thing is the reason or cause.
Many families break up because of a lack of money...
Because of the law in Ireland, we had to work out a way of getting her over to Britain.
仅仅因为 You use just because when you want to say that a particular situation should not necessarily make you come to a particular conclusion.
Just because it has a good tune does not mean it is great music...
Just because something has always been done a certain way does not make it right.
You can use because, as, since, or for to give an explanation for something. Because is the commonest of these, and is used when answering a question beginning with 'why?'.You can use as or since instead of because to introduce a clause containing a reason for something, especially in writing. ...a note about The National Portrait Gallery, as the word 'Gallery' can be misleading... Since the juice is quite strong, you should always dilute it. In stories, for is sometimes used to explain or justify something. He seemed to be in need of company, for he suddenly went back into the house. Note that because is a conjunction, and is used to link two ideas within one sentence. I'm unsocial, because of my deafness.
because, as, since 或者 for 都可以用来给出解释。because 最常用，用来回答以 why 开头的疑问句。as 或 since 可以代替 because 引导原因从句，尤其是在书面语中：a note about The National Portrait Gallery, as the word ‘Gallery’ can be misleading（对 The National Portrait Gallery 的注释，因为 Gallery 一词容易令人误解），Since the juice is quite strong, you should always dilute it（这种果汁太浓，所以必须加以稀释）。在故事中，for有时用于解释或论证：He seemed to be in need of company, for he suddenly went back into the house（他看起来需要陪伴，因为他突然回到了屋里）。注意，because 是连词，用来连接一个句子中的两个观点：I'm unsocial, because of my deafness（我耳朵聋，所以不善交际）。
I study because I want to learn.
2. [用于引导一个名词从句，相当于 that 或 the fact that]…这一事实，…这一点原因，原因是
The reason I am here is because I want to ask for your help.
I think it would make her feel better because.
You must not think ill of her because she did not love you.