because 除經常用于引導原因狀語從句外,還可引出表語從句或用于強調句等。如:
It is because you’re eating too much. 那是因為你吃得太多了。
It was because I wanted to buy a dictionary that I went to town yesterday. 我昨天是由于想買本字典而進城的。
參考文獻:http://www.hz123456.com/Article/201108/2383.html
because引導的從句是作表語,because 是一個連接詞,不作成分。意思是 “因為。。”如That he didn't come to school was because he was ill then. 他沒來上學是因為他當時病了