A. Could you please tell me if the sentences below are natural?
He had the answer, but he said nothing. Instead, he went and brought a large box including/containing some photos.
B. Is the word "include" correct in the sentences above?
"including" is not right. "containing" is OK. The rest of it is OK.
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he went and brought does not sound natural to my ear. I suggest eg he went and got.
Clive