Question

when we went to his hause (read) a book
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Answer 1

Answer:

When we went to his house, he was reading a book. The work was continuous , so past continuous tense is used. Sub + was/were+ ING form of verb+ object. Hope it helps, mark as brainliest if it does.

Answer 2

if you are asking for changing the tenses in the sentence then your answer will be

"when we went to his house he was reading a book"

I hope it help you and if it does please mark my answer as brainliest