Because 和because of可用于表原因。
Because搭配小句，可与 as, since, for互换：
Because he is careless, he makes mistakes
Jack could not enter the race as he was injured.
They stole the buns for they were hungry.
Since they are generous, they always donate to charity.
Because of 搭配名词，代词，动名词，可与due to互换：
Because of his carelessness, he makes mistakes.
I was published because of him.
He fell sick because of working too hard.
Jack could not enter the race due to his injury.
Reference
Teo, Alvin. 2019. Confusing Grammar Explained. Singapore: Marshall Cavendish Education.
