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Some students ran back to the dormitory,magazines()under the

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Some students ran back to the dormitory,magazines()under their arms.为什么选held,而不是holding或其他?
还有一道,
The concert usually takes place at the People's Square,with the audience()on the ground.为什么选seated不选seating?
这类句型有什么规律呢?
第二道是不是没有with的话,seat就变成主动,选seating了
Some students ran back to the dormitory,magazines()under the
答:分词与其逻辑主语的关系决定用过分、现分.
1.独立主格结构,分词独立的逻辑主语magazines 与hold是被动关系,选过去分词held.
2the audience与seat是被动关系.seat sb.on -> sb be seated on可用sitting