1. because 是連詞，其后接句子；because of 是復(fù)合介詞，其后接名詞、代詞、動(dòng)名詞、what 從句等。如：
I didn’t buy it because it was too expensive. 我沒有買是因?yàn)樗F了。
He is here because of you (that). 他為你(那事)而來(lái)這里。
He lost his job because of his age. 由于年齡關(guān)系他失去了工作。
We said nothing about it, because of his wife’s being there. 因?yàn)樗拮釉谀莾?，我們?duì)此只字未提。
He knew she was crying because of what he had said. 他知道她哭是因?yàn)樗f(shuō)的話。
注：because of 之后可接 what 從句，但不能接 that 從句或沒有引導(dǎo)詞的句子。如：
他因病未來(lái)。
誤：He didn’t come because of he was ill.
誤：He didn’t come because of that he was ill.
正：He didn’t come because he was ill.
正：He didn’t come because of his illness.
比較以下同義句：
他離開了這家公司，是因?yàn)槔习逶跁?huì)上講的話。
正：He left the company because of what the boss said at the meeting.
正：He left the company because of the thing that the boss said at the meeting.
我不能因?yàn)橛袀€(gè)家就停止斗爭(zhēng)。
正：I can’t stop fighting because I have a family.
正：I can’t stop fighting because of having a family.
2. because 所引導(dǎo)的從句除用作原因狀語(yǔ)外，還可用作表語(yǔ)。如：
It is because he loves you. 那是因?yàn)樗麗勰恪?BR> 而復(fù)合介詞 because of 所引導(dǎo)的介詞短語(yǔ)通常用作狀語(yǔ)而不用作表語(yǔ)。如：
他因雨缺席。
誤：His absence was because of the rain.
正：His absence was due to the rain.
正：He was absent because of the rain.
但是有時(shí)若主語(yǔ)是代詞(不是名詞)，也可以用 because of 引出的短語(yǔ)作表語(yǔ)。如：
It is just because of money. 那只是因?yàn)殄X的原因。
That was because of his sickness. 那是因?yàn)樗〉脑颉?
I didn’t buy it because it was too expensive. 我沒有買是因?yàn)樗F了。
He is here because of you (that). 他為你(那事)而來(lái)這里。
He lost his job because of his age. 由于年齡關(guān)系他失去了工作。
We said nothing about it, because of his wife’s being there. 因?yàn)樗拮釉谀莾?，我們?duì)此只字未提。
He knew she was crying because of what he had said. 他知道她哭是因?yàn)樗f(shuō)的話。
注：because of 之后可接 what 從句，但不能接 that 從句或沒有引導(dǎo)詞的句子。如：
他因病未來(lái)。
誤：He didn’t come because of he was ill.
誤：He didn’t come because of that he was ill.
正：He didn’t come because he was ill.
正：He didn’t come because of his illness.
比較以下同義句：
他離開了這家公司，是因?yàn)槔习逶跁?huì)上講的話。
正：He left the company because of what the boss said at the meeting.
正：He left the company because of the thing that the boss said at the meeting.
我不能因?yàn)橛袀€(gè)家就停止斗爭(zhēng)。
正：I can’t stop fighting because I have a family.
正：I can’t stop fighting because of having a family.
2. because 所引導(dǎo)的從句除用作原因狀語(yǔ)外，還可用作表語(yǔ)。如：
It is because he loves you. 那是因?yàn)樗麗勰恪?BR> 而復(fù)合介詞 because of 所引導(dǎo)的介詞短語(yǔ)通常用作狀語(yǔ)而不用作表語(yǔ)。如：
他因雨缺席。
誤：His absence was because of the rain.
正：His absence was due to the rain.
正：He was absent because of the rain.
但是有時(shí)若主語(yǔ)是代詞(不是名詞)，也可以用 because of 引出的短語(yǔ)作表語(yǔ)。如：
It is just because of money. 那只是因?yàn)殄X的原因。
That was because of his sickness. 那是因?yàn)樗〉脑颉?