英语句式变化!The monkey is eating a banana.(复数句）He is reading a bo

The monkey is eating a banana.(复数句）
The monkey is eating bananas.
He is reading a book.(一般疑问句)
Is he reading a book?
I can cook meals.一般疑问句
Can I cook meals?
I am answering a phone.特殊疑问句
What are you doing?
They are watching insects.变单数第三人称
He is watching insects.