that作为关系代词,可以引导定语从句,充当句子成分,在从句中作宾语时可以省略;that引导同位语从句时,起连词的作用,没有实际意义,不充当句子成分,一般不能省略。 试比较下面两个例句: (1)I had no idea that you were here.我不知道你...
2.当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”。如: (1) Is Jim a good student? I don’t know I don’t know if /whether Jim is a good student. (2) Does Kate get up early? Do you know? D...
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