it is a big job to pack up all the letters ,but I am really

finished adj.完成的,做完的 ,后面不能跟名词,表示昨晚一件事情、工作等
上句也可以写成：but I finished it already.这里,finish是动词,后面跟宾语it
finished 作形容词的例句还有：
▪ He started his homework two hours ago and he still isn't finished.他2小时前开始写作业,还没写完呢.
▪ I'll wait here until you're finished.我在这里等着,等你忙完

现在完成时。