下列英语句子是否正确，如果有错麻烦改正，速度

1.I came home to find the keys were missing 我回到家发现钥匙丢了
2.I was at the door waiting for an hour 我在门口等了一个小时
3.I had read books before I lost my keys 丢钥匙前我读书
4.I saw my keys in the classroom for the last time,so they also could be in the clssroom.我最后一次看见我的钥匙在教室，所以它们也可能还在教室
5.I would go to the library and the classroom and try to find them.我将要去图书馆，教室并且努力找到它们
6.If I could't find my keys in the end,I'd buy new locks.如果我最后找不到我的钥匙，我将会买新锁子

像是一篇文章，时态一致。错误很少。

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还能输入 9999 字