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英语的简单句,一般有下列几种句型结构: The sun rises in the east. ( 主谓 ) We are working. (主系表) He likes dancing. (主谓宾) We elected him monitor. (主谓宾宾 补) He gave me a book yesterday. (主谓间) He gives some money to the poor man. (主谓直宾) 请写出下列句子的句型结构: Let the fresh air in.( ) 让新鲜空气进来。