because詞性是介詞或者連詞，例如：
1、They are here because of us.他們是因爲我們來這裏的。
2、We couldn't understand them because they were talking in Chinese.我們聽不懂他們在講些什麼，因爲他們說的是漢語。
3、His school work is suffering because of family problems.由於家庭問題，他的學業日漸退步。
because是及物動詞還是不及物動詞
because不是動詞
because 連詞，表示“因爲”
1、because + 表示原因的句子
The boy ran away because he was scared.
那個男孩子跑走了，是因爲他害怕。
The little girl can’t go to school because she was not old enough.
小女孩不能上學因爲她的年紀不夠大。
because語氣很強
表示直接因果關係時，用because表示原因
2、用作why問句的答語
--Why did you call?
–Because I missed you.
--你爲什麼打電話來
--因爲我想你了呢。
3、because從句可放在 主句前 或 主句後，更常用於主句後
放在主句前 時，通常要用 逗號 與主句分開
放在主句後時，則不需要逗號。
He was ill because he drank too much wine.
= Because he drank too much wine， he was ill.
因爲他喝太多酒，所以生病了。
We were late because we overslept.
=Because we overslept， we were late.
因爲我們睡過頭了，所以遲到了。
