英语中什么时候结尾一些词不能省略 比如I don't know what they are talking 还是要加ab

英语中什么时候结尾一些词不能省略 比如I don't know what they are talking 还是要加ab i don‘t know what you're talking about和i don‘t know what are I don't really c____ about what they are talking. I don't What are you talking I don’t know what they are looking fo I don't know what are you thinking about?还是I don't know what I don't understand you.I don't know what you are thinking ab I don't know what are you 求“I don’t know what you’re talking about ”的中文意思?要标准答案噢. 英语分析：Sorry.I don't know you talking about 宾语从句中,是I don't know what the matter is,还是I don't know what's They don't know what---