()Additional complication The first three sentences each begin with a prepositional phrase; in the fourth sentence, the part after the first comma assumes a parenthetic structure and the last sentence begins with a present participle phrase and it has a long appositive phrase at its end with an attributive clause embedded(2) Additional complication： • The first three sentences each begin with a prepositional phrase; in the fourth sentence, the part after the first comma assumes a parenthetic structure; and the last sentence begins with a present participle phrase and it has a long appositive phrase at its end with an attributive clause embedded