____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?
问题描述：
____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?
____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?
答
do为及物动词后必须接宾语，what 充当其宾语，而where为副词作状语
答
应该用WHAT，因为这句话强调的是“那只鸟在干什么”所以用“WHAT”
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答
What 因为问句里没说明鸟在干什么,所以重点在动作sing,应该用what 提问
答
选WHAT. what is/ are somebody(s) doing? 是现在进行时的典型例句，主要询问对方正在做什么，重点是doing。如果要用WHERE的话，问句中的doing要省略，直接是where are the birds 进行提问。