1. because conj. （引導原因狀語從句）

He didnt go to school yesterday because he was ill. 他昨天沒去學校，因為他病了。

He is called Mitch， because his name is Mitchell. 人們叫他米奇，因為他名叫米切爾。

2. because of prep.

Shes worried because of her son. 她因為她的兒子而擔心。

He is here because of you / that. 他為你/那事而來這里。

I would like to do everything for you because of loving you. 因為我愛你，我愿意為你做任何事。

It is because of his help that you can enter the university. 這是因為他的幫助，你才能夠上大學。

3. because還可以回答why引導的句子。

—Why do you like pandas？ 你為什么喜歡熊貓？

—Because they are cute. 因為它們很可愛。

【注】 because和so不能一起連用，二者只能用其一。

【典型例題】

1. I didnt go to the party not ____ the weather， but ____ I didnt feel well.

A. because of； because B. because； because of

C. because； because D. because of； because of

【答案】 A

【解析】 句意：我沒有去參加這個聚會不是因為天氣，而是因為我的身體感覺不舒服。分析because of和because的區(qū)別：because of視為一個介詞，其后跟名詞、代詞或動名詞（短語）；而because是一個連詞，后面引導一個成分完整的原因狀語從句（有自己的主謂賓語等）。根據(jù)本句：the weather就是一個名詞“天氣”，所以用介詞短語because of；I didnt feel well就是一個完整的句子，所以用連詞because。故選A。

2. Tony didnt come to school last week ____ he was ill. And ____ his illness he missed a lot of lessons.

A. because； because B. because of； because of

C. because； because of D. because of； because

【答案】 C

【解析】 句意：Tony上周沒有來上學，因為他生病了。并且因為他的病，他落下了很多課。because是一個連詞，后面引導原因狀語從句；because of后跟名詞、動名詞或名詞性從句。根據(jù)它們的用法可知選C。