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选修6 Unit 5（2） The other two climbed down into the crater to collect some lava for later study，but this being my first experience，I stayed at the top and watched them. 另外两人攀下火山口去收集供日后研究用的岩浆，我是第一次经历这样的事，所以留在山顶上观察他们。 this being my first experience是独立主格结构。其主要的构成方式如下： (1)独立分词结构：名称或代词主格＋分词 ①The guide leading the way，we had no trouble getting out of the forest.向导领着路，我们毫不费劲地走出了森林。 ②He walked into the classroom，his_head_lowered. 他低着头走进教室。 (2)名称或代词主格＋不定式 ③More presents to be given，she will find it difficult to accept. 再多给她一些礼物，她就会觉得很难接受。 (3)名称或代词主格＋形容词(副词、名词、介词短语) ④There_being_no_one_else_to_turn_to，I had to come to see you. 我没有其他可以求助的人，只能来找你。 It is said that this boy，who had a great gift for language and persuasion，is the father of the Manchu people.据说这个男孩就是满族人的祖先，具有语言天赋和很强的说服力。 | 
