英文语法问题1.when and where hasn't been dicided yet 为什么要有yet 不写ye

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英文语法问题
1.when and where hasn't been dicided yet 为什么要有yet 不写yet行吗?写yet 的原因是什么?2.One of my friends has already moved to london 这句中省掉already 可以吗? 如果不可以那么要上already 的原因是什么呢?3.What do you say ?中有do 为什么 What he say ?没有了do 呢?4.名词性从句是靠什么单词来判断的?(希望英语高手分点回答我的提问)非常感谢回答的人~

第一,yet 这里就是说“尚且；还“的意思,也就是说换个时间地点（比如以后或别处）就可以做此决定.
第二,already可以省去,意思仍然相同,但是在有些情况下是必要的.比如有人问,怎么这么久没有见你那位朋友了,你回答时,就必须把”已经“包括,说明这位朋友没有在场的肯定原因.
第三,he 之前应该加 does 为 What does he say?或者 What he says?只是这样的用法极少.因为你在问的情况下,应该是问一件已经发生的事,用不上现代时态.
第四,名词从句用连代词表明,例如逗号后的when（指前半句提到的时间）,which（前半句的某事物）,that（整个前半句描述之事）.
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英反意疑问句的问题when they will start hasn't been decided yet,______ he hasn't been caught yet when hasn't been decided yet请帮我造一个名词性从句！谢谢 We have been waiting____us,but he hasn't come yet. Mrs.williams hasn't been to the butcher's yet. 69.__they will come here hasn't been decided yet. hasn't arrived yet 这句的语法讲解 I ordered my food an hour ago and it hasn't arrvied yet.为什么用 when and where to go for holiday have not been decided yet.这 when and where to go for my holiday__not been decided yet.填h my brother hasn't been back yet.=my brother hasn't returned 一.模仿例句回答以下问题例句1.问：Hasn‘t anyone opened the window yet?