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so that 引导目的状语从句与结果状语从句
so that引导目的状语从句时常与情态动词连用(= in order that),当主从句主语一致时可转换为so as to do/ in order to do.
1). He turned up the radio a little so that he could hear the news clearly. He turned up the radio a little so as to hear the news clearly.
2). He closed all the windows while driving so that he shouldn’t catch cold.(否定句中情态动词用shouldn’t)
[2] so that 引导结果状语从句一般不与情态动词连用。