可可英语每日一句口语：

Friendship isn't about who came first and who you've known the longest, it's about who came and never left.朋友不是先来的人或者认识最久的人，而是那个来了以后再也没有走的人。

【知识点讲解】

现在完成时：主语+have+动词过去分词

例句：I have done my homework.我已经完成作业了。