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The doctors have not yet decided how the woman died.

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The doctors have not yet decided how the woman died.
请问:这里的yet是干什么的?能否去掉?
The doctors have not yet decided how the woman died.
not yet
  尚未,还没有

在现在完成时的句子中,already常用于肯定句,yet常用于否定句和疑问句,但yet还有其他用法.
  ⒈用于否定句中,意思是“还、尚、迄今、到那时”.例如:
  He is not yet here. 他还未到.
  At three o'clock they had not yet decided whether to play basketball or not.
  三点钟时他们尚未决定是否去打篮球.
  ⒉用于疑问句中,意思是“已经”.例如:
  Is everything ready yet 一切都准备好了吗?
  ⒊与比较级连用,意思是“更”.例如:
  You must work yet harder. 你还需更努力地工作.
  ⒋与once,again,another 连用,意思是“再”.例如:
  He has made yet another mistake.
  他又犯了一个错误.
  ⒌用于肯定句中,意思是“仍然、还得”.例如:
  She is yet a child. 她还是个孩子.
  ⒍用作并列连词时,意思是“然而、可是”.例如:
  He studied hard yet he failed.
  他学习努力,可是考试仍未及格.
再问: 请问这里的“yet”可以换个位置么? 就这句话来说,都可以放在哪里?
再答: 一般来说 不能换到其他位子