because/bɪ'kɒz, -'kəz $ -'kɑːz/

conj. used to state the reason for sth

conj. 因为： [常用于对why问句的回答] “Why didn't Mike play football yesterday?” “Because he had hurt his leg.” “迈克昨天为什么没踢球？” “因为他的腿受伤了。”

◇We didn't go out because it was raining. 因为下雨，我们没出去。

because of sb/sth 因为：He lost his wallet because of carelessness. 他因粗心而把钱包丟了。

构词be- (= by) + cause→“通过…的原因”即“因为”

辨析as; because; for; since

辨析because of; due to