宾语从句中what和that嘚区别和用法是什么?
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that 作连词 只其连接作用,无实在意义不做句子成分,在口语和非正式文体中常省略.he said (that) it was cold in winter.mother knows (that) Jim will work hard.i'm afraid (that) he will forget it.what作连接代词,翻译为“什么”在句子可做主语、宾语、表语、定语等,但不能省略.tell me what's the matter we knew what he was doing.he asked what she was.i don't know what time it is .