Question

when we went to his house.he (read) a book correct tense​

Answer 1

when we went to his house, he was reading a book.

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Answer 2

Answer: When we went to his house, he was reading a book.

Explanation- When they went to his house , they found him reading book ( he continued to read his book when they went to his house)

The work was continuous , so past continuous tense is used.

Sub + was/were+ ING form of verb+ object.

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