谁知道怎么把下面的英语句子改成英语否定句

谁知道怎么把下面的英语句子改成英语否定句

题目
谁知道怎么把下面的英语句子改成英语否定句
There was a big house
She has a telephone
There were some books here
We could read books
答案
There wasn't a big house.
She doesn't have a telephone.
There weren't some books here.
We couldn't read books.
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