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初二 英语 改错 请详细解答,谢谢! (23 14:37:18)

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初二 英语 改错 请详细解答,谢谢! (23 14:37:18)
下面每句都有一处错误,请找出并改正.
1.I'm sorry I can't go in because I lost the key to the door.
2.Last year I have visited the Great Wall.
3.Have you had your medicine two hours ago?
4.Xiao Lin left his home for two months.
5.The writer's mother has died since he was seven years old.
6.How long have you joined the school football team?
7.I haven't heard a letter from my penfriend for a few months.
8.They have waited there for one and a half hours ago.
9.Where have you gone Xiao Ming?Someone called you just now.
10.Sorry, I haven't seen the notice(通知)this moring,so Iwas late.
1、to->for
2、have visited ->visited这是一般过去时的句子,不用现在完成时
3、同上Have had your medicine ->Did you took/had your medicine
4、刚好与上相反,left ->has left
5、has died ->has been dead
6、joined->been in/joined in
7、haven't heard ->didn't heard
8、for->since,for加时间段,since加时间点
9、gone->been,通俗用法
10、haven't seen ->didn't see