题目内容
15．When will he come back from America？I don't know．（合并为一句）I don't know whenhewillcome back from America．
分析 他什么时候会从美国回来？我不知道．
我不知道他什么时候会从美国回来．
解答 答案：he，will．根据要求这里是要改为含有宾语从句的主从复合句，主句是I don't know 是一般将来时，故从句时态不受限制，还用原句的一般将来时，从句是特殊疑问句，疑问词when充当引导词，后加陈述语序，故he will，故答案是he，will．
点评 本题旨在考查宾语从句这一语法，做这类题时，要从三方面考虑：一、选准连接词 二、连接词后紧跟从句的主语 三、若主句是过去时，从句要改为相对应的过去时．
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