题目内容
6.Was the machine invented by David?She wasn't sure.(合并成一句话)She wasn't sureif/whether the machine was invented by David.
分析 她不能确定,这台机器是不是大卫发明的?她不能确定这台机器是否是大卫发明的.
解答 答案:if/whether.本题是把两个简单句变成宾语从句,首先要找出主句和从句,从句是一般疑问句,表不确定,要用if或whether连接,意为"是否".故填if/whether.
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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