I have four boxes are full of books错哪了

...你的英语还真是不到家啊.I have four boxes已经是一个完整的句子了,主语、谓语、宾语都有了,后面怎么能又来一个句子呢?修改意见：I have four boxes which are full of books.这里which及后来的句子作宾语从句,用...