What引导的
特殊疑问句What引导的特殊疑问句基本结构有两种情况
（一）What +
一般疑问句？
（二）What+名词+一般疑问句？（what后面跟上名词时，what起形容词作用）
具体地说：
系动词做谓语： What + 系动词 + sb / sth？
What + 名词 + 系动词 + sb / sth？
情态动词做谓语：What + 情态动词 + sb / sth +
实义动词？
What + 名词 + 情态动词 + sb / sth + 实义动词？
行为动词做谓语：What +
助动词 + sb / sth + 实义动词？
What + 名词 + 助动词 + sb / sth + 实义动词？
助动词不能单独做谓语。
一、系动词做谓语：
（一）What + 系动词 + sb / sth？
◆询问“是什么”？
What is it / this / that? It is an eraser.
What are they (物)/ these / those？ They are foxes.
What is between the buildings? There are some trees.
What's this in English? It's an orange.