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英语高手请进After (being surrounded) by the police for several day

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英语高手请进
After (being surrounded) by the police for several days,the robber had to give in
为什么括号里要加上being,什么情况下不需要be呢?
He entered yje room,his head (lowered)
为什么用lowered 不用lowring
英语高手请进After (being surrounded) by the police for several day
eing surrounded,含有被动的意思.因为主语是the robber.指他被包围.当主语主动时,不必加be.比如:after entering the room,he found everything was gone.
2、因为这句话是并列的叙述过去一件事.lowered 与 entered 对应.