because 同 because of 既分別

because 同 because of 字義上解釋都是--因為；由於.
但because後面都有一個完整的「子句」.
例如: He was absent because he had a date yesterday.其中he had a date yesterday就是一個完整的子句.有主詞+動詞+時間.
而because of後面都有接一個名詞(或動名詞).
例如: I fall in love with her because of the weather.

The main difference between them is:
'Because' is an introduction of a statement. So, after because, there MUST be a verb.
'Because of' is an introduction of something or someone. So, after because of, there MUST be no verbs.

'because' is followed by a sentence,
while 'because of' is followed by a noun(things) ONLY!!!!!!!!!!!!!!!!!!!!!!!!!1

兩者都有「因為」的解釋，可是，
because後是一句原整的句子，
而because of 後則是名詞。

eg. Tom was absent this morning because he did not feel well.
Because of the traffice jam, Tom was late.

Because是連接詞，後面係跟句子；
because of是介係詞短語，後面係跟名詞或名詞性短詞。
希望能幫到你！

because 後面一定要跟一句sentence
Example: Because he worked hard, he scored 100 marks.
because of 後面一定要跟noun或者noun phrase
Example: Because of his hard work, he scored 100 marks.

because後面係跟句子
because of後面係跟名詞
例如: I wear the short because the weather is hot.
I wear the short because of the hot weather.

because = 原因是
because of = 由於