I don't know whether you want me answering again, but I would do it like this: A boy is passing by reading a book. -- He is passing and reading. A boy is passing by them, reading a book .
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AnonymousWould you say these say the same, assuming the two girls are not the ones who are taking pictures with a camera but rather the people having pictures taken (with their teachers)? I think they do.
Two girls are taking pictures with their teacher in front of the black board.
(your correction)
Two girls are having their pictures taken with