题目内容
13．John really didn't know how he could connect his runaway son．（改为简单句）John really didn't knowhow to connect his runaway son．
分析 约翰真的不知道怎样能联系他离家出走的儿子．
解答 答案：how to．根据know how he could connect his runaway son，可知how he could connect his runaway son在这里作know的宾语，构成宾语从句，要改成简单句，"疑问词+不定式"结构可以将某些含有连接代词或连接副词引导的宾语从句转换简单句．在这里把主语he和情态动词could去掉，how后面加上to．故填how to．
点评 本题考查了复合句和简单句的有关知识，做题时应注意正确区分简单句以及复合句，以及它们相互转化的方法．
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