ecause 是从属连词,接表示直接原因的从句,一般放在主句的后面,也可放在主句前面,它表示的语气最强,在回答why的问句时,必须用because.
例如：The swimming pool won't be open today because they're making repairs.
泳池今天不开放,因为他们在修理.
Why did you move to France?
你们为什么搬到法国?
Because my father found work in Paris.
因为我父亲在巴黎找到了工作.
注意：在英语中用了because后,不可再用so.
for 是并列连词,用来附带解释说明前一分句的原因或理由,for引导的并列句,一般放在所要说明的句子的后面.
例如：I went to see him,for I had something to tell him.
我去见他,因为我有事要告诉他.
只有therefore是表示结果的意思而不是原因.
