In both examples the use of the commas (making the clause non-restrictive) is a way of recognizing that all members of the class referred to ( some men ) have the same quality (They were wearing dark suits) and did the same thing (started shouting; came to the party as well). In contrast, the restrictive clauses acknowledge that there are other men not included among those who were wearing dark suits, but that only some of those included among those who were wearing dark suits participated in the action of the sentence (started shouting; came to the party as well). CJ
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navitasanIf I have understood correctly, if all the children had masks, 'B' should be used.If all the children in the group you're calling "some children" had masks, then yes. Use B. It's like saying
navitasanIf