They are lying on the beach.（就画线部分提问）
问题描述：
They are lying on the beach.（就画线部分提问）
答
如果画线部分是on the beach,答案是where are they lying?
如果画线部分是they,答案是who are lying on the beach?
如果画线部分是lying,答案是what are they doing on the beach?
答
若lying下划线： What are they doing on the beach?
若on the beach下划线： Where are they lying?
答
请问划线部分在哪里?
答
What are they doing on the beach?(就lying 提问）
Where are they lying ?(就on the beach 提问）
Who are lying on the beach?(就they提问