They are climbing the tree. 它们正在爬树
这是一个有be动词的陈述句
(1)变否定句,只需要在be动词“are”后面加“not”即可
整理:They are not climbing the tree. 它们没有在爬树
(2)变一般疑问句,只需要把be动词“are”提前即可
整理:Are they climbing the tree ? 它们正在爬树吗?
否定句:They aren't climbing the tree.
一般疑问句:Are they climbing the tree?