an interest,a benefit ,an advantage之间如何区分?

an interest,a benefit ,an advantage之间如何区分? have an advantage take a great interest in 和 take an interest in 与英文有关：a/an,one,the 该如何区分? 如何区分名词前面用a 还是用an 如何区分冠词 ( an 和 a ) +名词的用法 have an advantage over是什么意思 have an advantage over sb. benefit merit advantage之间的区别有哪些呢 take an interest in变为take a great interest in时an为什么要变为a show an interest what ------- interest book!A ; a B ；an求高手