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 because 除經(jīng)常用于引導(dǎo)原因狀語從句外，還可引出表語從句或用于強調(diào)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://m.52ysedu.com/Article/201108/2383.html

because引導(dǎo)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(xué)是因為他當(dāng)時病了