Welcome to the Forums, Manh! It's a matter of casting all the verbs in the past tense, since all the action in the model sentence is in the past. We don't know that the person seems serious now, but he was (seemingly) serious in the past.
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GPYFor me, it is not at all clear that (A) is incorrect. Does anyone else have a view on this?I think that A is correct, but B gets closer to the model sentence.
Manh NguyenI've just found this link http://www.grammaring.com/reporting-an-earlier-event-in-the-passive-voice In my opinion, "we thought" and "you were serious" happened simultaneously, so A must be correct. If B was correct, the model sentence should be
GPY"We thought you were crying when you arrived" -> "You were thought to be crying when you arrived""We thought you had been crying when you arrived" -> "You were thought to have been crying when you arrived"I meant to add that, while these examples seem coherent, it seems to me that the following may also be possible: