i have becom good friends with him 还是i have becom good friend with him

两个都不对,主语是I（我,第一人称单数）,我一个人只能是“一个朋友”,不会是“朋友们”（friends复数）,所以第一句不对.第二句虽然朋友用了单数,但是单数名词前面要使用冠词,应该是：I have become a good friend with him.（我与他成为好朋友） 或：I have become a good friend of his.（我成为他的一个好朋友）