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有几道英文题不会做,是几道改错题.

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有几道英文题不会做,是几道改错题.
句子改错.
When Ton hurried home,he found that his mother has already been sent to hosptial.
We learned five English songs by the end of last term.
He have gone home when I got to his office.
He asked what I have said.
She lived in New York for eight years before she came to China.
哪错了,怎么错的,最重要的是怎么改.
第一句,现在完成时要改过成过去完成时,因为动作发生在found之前,是过去的过去.has already...改为had already
第二句也用过去完成时,因为是到上学期结束的时候.learned改为had learned
第三句同理,have gone改为had gone
第四句同理,have said改为had said
第五句的道理也同第一句一样,lived改为had lived,因为lived这个动作发生在came之前.