新概念3册第5课最后一段话的语法结构分析请教?

这是新概念3册的第5课中的最后一段话,原文是:
However, he had at last been allowed to send a fax in which he informed the editor that he had been arrested while counting the 1,084 steps leading to the fifteen-foot wall which surrounded the president's palace.
我的问题是:
1.counting为什么加ing
2.leading为什么加ing
2.surround为什么加ed

第1个回答  2022-01-26
问题1,in which 引导一个定语从句,来说明传真的内容,因为内容是in the fax的,所以要用in which。
问题2,he had at last been allowed to send a fax是句子主干,in which 是定性定于从句修饰fax;which surrounded the president's palace是定于来修饰定于从句中的wall。本回答被提问者采纳
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