1、because是連詞，意思是：因?yàn)?；由于。可用來引?dǎo)讓步狀語從句,這時,通常用于否定句或疑問句中。還可引導(dǎo)表語從句。

2、because of 是復(fù)合介詞，意思是：因?yàn)椋捎冢ㄕf明）。其后可接名詞、代詞、動名詞或由what引導(dǎo)的從句（但不是直接接從句）。當(dāng)主語是代詞時，because of短語在句中可用作表語。

例句：

1.because+句子
We didn't go on holiday because we were very busy.我們沒有去度假因?yàn)槲覀兎浅Ｃβ怠?

They were very happy because their dreams came true.他們非常開心因?yàn)樗麄兊膲粝雽?shí)現(xiàn)了。

He came back late because there was something wrong with his car.他回來晚了，因?yàn)槠嚦隽斯收稀?

He didn't come because of the heavy rain.因?yàn)橄麓笥?，所以他沒有來。

He was angry because of you.他因你而生氣。