区别：
1、从词性上看
because 是连词，其后接句子；because of 是复合介词，其后接名词、代词、动名词、what 从句等。如：
I didn't buy it because it was too expensive. 我没有买是因为它太贵了。
He is here because of you (that). 他为你(那事)而来这里。
He lost his job because of his age. 由于年龄关系他失去了工作。
We said nothing about it, because of his wife's being there. 因为他妻子在那儿，我们对此只字未提。
He knew she was crying because of what he had said. 他知道她哭是因为他说的话。
注意：because of 之后可接 what 从句，但不能接 that 从句或没有引导词的句子。
2、从用法上看
because 所引导的从句除用作原因状语外，还可用作表语。
而复合介词 because of 所引导的介词短语通常用作状语而不用作表语。
但是有时若主语是代词(不是名词)，也可以用 because of 引出的短语作表语。
扩展资料：
Because例句：
1、There are lots of parents that are despondent because they have a child that has a mobile addiction.
很多家长因子女玩移动设备上瘾而感到沮丧。
2、It is because of this that seed asia work stoconnect investors with entrepreneurs offline.
3、It is just because of money. 那只是因为钱的原因。
4、That was because of his sickness. 那是因为他生病的原因。
5、It is because he loves you. 那是因为他爱你。
参考资料：百度百科-because
because与because of用法辨析
because是连词，引导从句，because of是复合介词，后面加名词或相当于名词的词、代词、动名词、what 从句等。例如：
1、Please be brief because I am in a hurry. 我有急事，请长话短说。
2、I did not go to the cinema because of the intense cold. 我因为严寒没出去看电影。
3、I didn't buy it because it was too expensive. 我没有买是因为它太贵了。
4、He is here because of you (that). 他为你(那事)而来这里。
5、He lost his job because of his age. 由于年龄关系他失去了工作。
扩展资料
判断断语还是句子的标准：
单独取出because或because of的内容，如果有动词（也就是谓语）的是句子，如果没有则是断语。
例如：
1、I didn't go to school because i am ill. am是谓语（动词）
2、 I didn't go to school because of my illness. my illness是短语（名词）
参考资料：百度百科-because （英语单词）
区别：
1、词性不同
because 是连词，其后接句子；because of 是复合介词，其后接名词、代词、动名词、what 从句等。如：
I didn’t buy it because it was too expensive. 我没有买是因为它太贵了。
He is here because of you (that). 他为你(那事)而来这里。
2、搭配不同
because 所引导的从句除用作原因状语外，还可用作表语。而复合介词 because of 所引导的介词短语通常用作状语而不用作表语。
It is because he loves you. 那是因为他爱你。
His absence was due to the rain.
扩展资料
例句
1、He is called Mitch, because his name is Mitchell
2、Many families break up because of a lack of money
许多家庭由于缺钱而破裂。
3、Just because it has a good tune does not mean it is great music
仅凭旋律优美并不见得就是一首杰出的音乐作品。
4、Because it is an area of outstanding natural beauty, you can't build on it
考虑到这一带自然风光旖旎，你不能建在这里。
参考资料来源：百度百科：because
本回答被网友采纳但在用法上两者不一样：
A: because 是从属连词， 后接原因状语从句
如：
1. He didn't go to school yesterday because it was raining.
由于下雨，他昨天没上学。
2. John didn't attend the meeting because he was ill.
约翰没有出席会议, 因为他病了。
比较：
B：because of 是个短语介词，不可以引导原因状语从句，而应该接名词，代词等
如：
1. He didn't go to school yesterday because of the rain.
由于下雨，他昨天没上学。
2. John didn't attend the meeting because of his illness.
约翰没有出席会议, 因为他病了。
拓展：
1. because, as, since, now that 等引导原因从句
2. because of 等于owing to; thanks to; due to; on account of 后接名词或者代词。