There is a book on the table.(用then改写句子)

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There is a book on the table.(用then改写句子)

There is a book on the table.(用then改写句子)
There is a book on the table.(用then改写句子)

There is a book on the table.(用then改写句子)
改为:
There was a book on the table then.
then 那时,是一般过去时的标志.

There was a book on the table then.