where are they为什么要用they

where are they为什么要用they where are they come from为什么不对?说他们来自那个国家为什么要用where do they come from?where are they come from 为什么不对?do 和 are各在什么情况下用呀? where they are 和where are they I can't find my glasses where are they? I can't find my glass.where are they? 用is.am.are填空 where ( ) they? where are they where are they where are they where are they where are they all where are they takeing Where are () (they )keys Scientics think that the continents ( weren‘t ) always where they ( are ) today为什么第一个空填weren‘t,而第二个空填are啊第一个空不是有always吗?那应该用一般现在时啊 where are the books?don,t worry,they------ here in no time .空里填will be sent 还是are sending.为什么答案是are sending, are those your cousins ,kate?为什么用Yes,they are.No,they aren't 回答?为什么不用those are回答 Scientists think that the continents___always where they ___today.A.weren't:are B.aren't:are -Are they happy?—Not they,为什么不是not them?而且为什么可以用not?为什么不用they aren't